Union Membership, Coverage, Density and Employment by Industry, 1991 (details in table note)
CIC	Industry Name	Obs	Employment	Members	Covered	%Mem	%Cov
	AGRICULTURE	2,056	1,149,380	19,640	22,128	1.7	1.9
10	Agricultural production, crops	892	535,189	8,854	10,287	1.7	1.9
11	Agricultural production, livestock	830	412,034	6,009	6,465	1.5	1.6
20	Agricultural services, exc. horticultural	334	202,157	4,777	5,377	2.4	2.7
	FORESTRY AND FISHERIES	795	463,228	16,720	20,649	3.6	4.5
21	Horticultural services	557	367,369	12,672	13,550	3.4	3.7
30	Forestry	165	59,991	4,048	7,042	6.7	11.7
31	Fishing, hunting, and trapping	73	35,867	0	57	0.0	0.2
	MINING	1,352	677,005	101,239	114,134	15.0	16.9
40	Metal mining	162	59,100	16,448	19,857	27.8	33.6
41	Coal mining	280	135,582	47,653	50,245	35.1	37.1
42	Crude petroleum and natural gas extraction	696	376,506	13,903	16,938	3.7	4.5
50	Nonmetallic mining and quarrying, exc. fuel	214	105,818	23,235	27,094	22.0	25.6
60	CONSTRUCTION	8,741	5,114,713	1,143,669	1,222,796	22.4	23.9
	MANUFACTURING, NONDURABLE GOODS	14,209	8,190,647	1,478,962	1,594,820	18.1	19.5
100	Meat products	813	448,226	89,894	97,874	20.1	21.8
101	Dairy products	260	143,228	36,168	39,052	25.3	27.3
102	Canned and preserved fruits and vegetables	400	203,498	59,949	61,746	29.5	30.3
110	Grain mill products	261	147,168	30,852	35,874	21.0	24.4
111	Bakery products	357	206,132	66,742	70,881	32.4	34.4
112	Sugar and confectionery products	196	106,112	33,855	35,016	31.9	33.0
120	Beverage industries	342	233,411	57,484	60,826	24.6	26.1
121	Miscellaneous food preparations and kindred products	315	180,473	37,731	40,872	20.9	22.6
122	Not specified food industries	7	3,956	2,113	2,113	53.4	53.4
130	Tobacco manufacturers	96	56,558	16,025	16,935	28.3	29.9
132	Knitting mills	251	114,314	7,153	7,153	6.3	6.3
140	Dyeing and finishing textiles, exc. wool and knit goods	50	25,243	3,497	3,497	13.9	13.9
141	Floor coverings, exc. hard surface	70	57,466	1,818	2,281	3.2	4.0
142	Yarn, thread, and fabric mills	807	431,613	30,199	35,304	7.0	8.2
150	Miscellaneous textile mill products	76	39,809	3,881	4,272	9.7	10.7
151	Apparel and accessories, exc. knit	1,450	854,402	129,114	142,092	15.1	16.6
152	Miscellaneous fabricated textile products	253	131,214	17,585	17,702	13.4	13.5
160	Pulp, paper, and paperboard mills	563	320,892	159,221	164,204	49.6	51.2
161	Miscellaneous paper and pulp products	308	192,755	49,020	50,576	25.4	26.2
162	Paperboard containers and boxes	345	215,162	73,976	79,598	34.4	37.0
171	Newspaper publishing and printing	893	484,162	68,527	73,711	14.2	15.2
172	Printing, publishing, allied industries, exc. newspapers	1,979	1,200,417	122,300	134,580	10.2	11.2
180	Plastics, synthetics, and resins	266	149,486	18,009	19,545	12.0	13.1
181	Drugs	524	302,255	27,468	30,050	9.1	9.9
182	Soaps and cosmetics	312	181,636	21,394	22,851	11.8	12.6
190	Paints, varnishes, and related products	111	67,589	10,370	11,202	15.3	16.6
191	Agricultural chemicals	99	52,741	6,635	6,916	12.6	13.1
192	Industrial and miscellaneous chemicals	1,027	583,260	102,847	113,680	17.6	19.5
200	Petroleum refining	261	165,836	48,867	52,981	29.5	31.9
201	Miscellaneous petroleum and coal products	37	23,002	5,275	6,485	22.9	28.2
210	Tires and inner tubes	137	80,070	28,120	29,335	35.1	36.6
211	Other rubber products, plastics footwear and belting	230	127,934	24,684	25,047	19.3	19.6
212	Miscellaneous plastics products	869	520,281	66,138	72,986	12.7	14.0
220	Leather tanning and finishing	23	13,299	4,596	4,596	34.6	34.6
221	Footwear, exc. rubber and plastic	146	85,554	11,363	15,966	13.3	18.7
222	Leather products, exc. footwear	75	41,493	6,092	7,022	14.7	16.9
	MANUFACTURING, DURABLE GOODS	19,233	11,534,838	2,530,568	2,722,362	21.9	23.6
230	Logging	174	94,851	4,773	5,779	5.0	6.1
231	Sawmills, planing mills, and millwork	570	347,724	64,356	68,437	18.5	19.7
232	Wood buildings and mobile homes	84	57,731	1,250	1,621	2.2	2.8
241	Miscellaneous wood products	212	118,899	14,101	15,355	11.9	12.9
242	Furniture and fixtures	1,035	589,930	83,921	91,526	14.2	15.5
250	Glass and glass products	271	157,461	60,739	61,646	38.6	39.2
251	Cement, concrete, gypsum, and plaster products	302	181,677	40,668	41,912	22.4	23.1
252	Structural clay products	65	40,729	8,907	9,440	21.9	23.2
261	Pottery and related products	73	40,002	9,897	9,897	24.7	24.7
262	Miscellaneous nonmetallic mineral and stone products	210	122,660	25,929	26,469	21.1	21.6
270	Blast furnaces, steelworks, rolling and finishing mills	589	369,985	185,670	191,453	50.2	51.7
271	Iron and steel foundries	153	103,031	33,236	36,014	32.3	35.0
272	Primary aluminum industries	216	132,170	48,086	50,018	36.4	37.8
280	Other primary metal industries	345	181,132	47,228	48,624	26.1	26.8
281	Cutlery, handtools, and other hardware	172	107,526	22,552	23,632	21.0	22.0
282	Fabricated structural metal products	729	442,175	93,893	98,553	21.2	22.3
290	Screw machine products	100	64,379	13,911	13,911	21.6	21.6
291	Metal forgings and stampings	198	116,977	43,900	45,633	37.5	39.0
292	Ordnance	148	87,773	28,684	32,275	32.7	36.8
300	Miscellaneous fabricated metal products	508	319,862	82,357	84,861	25.7	26.5
301	Not specified metal industries	4	3,337	0	0	0.0	0.0
310	Engines and turbines	118	85,478	39,353	42,355	46.0	49.6
311	Farm machinery and equipment	198	102,962	29,471	31,375	28.6	30.5
312	Construction and material handling machines	349	217,263	53,882	57,732	24.8	26.6
320	Metalworking machinery	477	264,527	33,361	36,057	12.6	13.6
321	Office and accounting machines	121	73,801	4,390	5,331	5.9	7.2
322	Electronic computing equipment	1,070	619,947	17,600	25,925	2.8	4.2
331	Machinery, exc. electrical, n.e.c.	1,598	970,741	156,180	165,305	16.1	17.0
332	Not specified machinery	4	2,494	0	0	0.0	0.0
340	Household appliances	234	142,276	45,031	48,547	31.7	34.1
341	Radio, T.V., and communication equipment	654	404,798	45,408	51,356	11.2	12.7
342	Electrical machinery, equipment, and supplies, n.e.c.	2,216	1,349,027	199,751	220,386	14.8	16.3
350	Not specified electrical machinery, equipment, and supplie	27	17,929	1,054	1,054	5.9	5.9
351	Motor vehicles and motor vehicle equipment	1,839	1,053,868	524,575	542,755	49.8	51.5
352	Aircraft and parts	862	600,773	189,370	219,038	31.5	36.5
360	Ship and boat building and repairing	410	239,351	76,790	88,001	32.1	36.8
361	Railroad locomotives and equipment	53	34,294	12,959	13,171	37.8	38.4
362	Guided missiles, space vehicles, and parts	605	400,878	65,763	78,815	16.4	19.7
370	Cycles and miscellaneous transportation equipment	82	50,056	8,597	9,144	17.2	18.3
371	Scientific and controlling instruments	445	263,748	26,674	28,728	10.1	10.9
372	Optical and health services supplies	632	380,608	21,052	22,286	5.5	5.9
380	Photographic equipment and supplies	223	118,763	8,777	13,234	7.4	11.1
381	Watches, clocks, and clockwork operated devices	20	10,364	3,080	3,080	29.7	29.7
382	Not specified professional equipment	0
390	Toys, amusement, and sporting goods	208	113,534	17,099	17,099	15.1	15.1
391	Miscellaneous manufacturing industries	572	304,482	32,149	39,660	10.6	13.0
392	Not specified manufacturing industries	58	32,867	4,142	4,875	12.6	14.8
	TRANSPORTATION	7,924	4,569,885	1,825,673	1,950,963	40.0	42.7
400	Railroads	561	285,586	223,934	226,518	78.4	79.3
401	Bus service and urban transit	776	454,429	196,504	211,525	43.2	46.5
402	Taxicab service	119	64,716	5,397	5,397	8.3	8.3
410	Trucking service	2,783	1,617,236	399,071	427,867	24.7	26.5
411	Warehousing and storage	220	128,573	19,077	20,759	14.8	16.1
412	U.S. Postal Service	1,513	863,449	636,946	695,978	73.8	80.6
420	Water transportation	283	172,126	53,555	56,237	31.1	32.7
421	Air transportation	1,150	696,439	260,472	274,426	37.4	39.4
422	Pipe lines, exc. natural gas	40	19,398	1,970	1,970	10.2	10.2
432	Services incidental to transportation	479	267,932	28,746	30,286	10.7	11.3
	COMMUNICATIONS	2,652	1,553,996	510,760	570,512	32.9	36.7
440	Radio and television broadcasting	463	253,739	23,007	27,977	9.1	11.0
441	Telephone (wire and radio)	1,860	1,106,933	469,879	523,086	42.4	47.3
442	Telegraph and miscellaneous communications services	329	193,324	17,874	19,450	9.2	10.1
	UTILITIES AND SANITARY SERVICES	2,768	1,555,951	526,817	566,116	33.9	36.4
460	Electric light and power	1,307	706,826	266,203	280,807	37.7	39.7
461	Gas and steam supply systems	357	186,540	56,061	58,832	30.1	31.5
462	Electric and gas, and other combinations	285	177,383	67,404	76,147	38.0	42.9
470	Water supply and irrigation	353	205,534	55,290	64,007	26.9	31.1
471	Sanitary services	452	269,608	80,416	84,880	29.8	31.5
472	Not specified utilities	14	10,059	1,442	1,442	14.3	14.3
	WHOLESALE TRADE	6,840	4,026,618	281,612	310,335	7.0	7.7
500	Motor vehicles and equipment	322	194,972	12,656	15,039	6.5	7.7
501	Furniture and home furnishings	84	47,885	1,788	1,788	3.7	3.7
502	Lumber and construction materials	268	161,394	15,368	16,812	9.5	10.4
510	Sporting goods, toys, and hobby goods	73	43,119	1,863	1,863	4.3	4.3
511	Metals and minerals, exc. petroleum	127	79,968	10,347	11,229	12.9	14.0
512	Electrical goods	456	279,999	8,648	10,210	3.1	3.6
521	Hardware, plumbing and heating supplies	368	209,911	7,818	9,834	3.7	4.7
522	Not specified electrical and hardware products	0
530	Machinery, equipment, and supplies	1,595	950,113	28,537	33,393	3.0	3.5
531	Scrap and waste materials	222	136,155	10,269	10,269	7.5	7.5
532	Miscellaneous wholesale, durable goods	106	62,923	3,178	3,178	5.1	5.1
540	Paper and paper products	219	122,304	6,925	6,925	5.7	5.7
541	Drugs, chemicals, and allied products	347	213,428	6,193	7,214	2.9	3.4
542	Apparel, fabrics, and notions	191	105,040	9,998	13,333	9.5	12.7
550	Groceries and related products	1,215	740,409	116,925	125,722	15.8	17.0
551	Farm products - raw materials	195	88,632	927	1,153	1.0	1.3
552	Petroleum products	258	137,481	5,271	5,388	3.8	3.9
560	Alcoholic beverages	192	120,409	24,469	26,076	20.3	21.7
561	Farm supplies	213	118,565	2,698	3,177	2.3	2.7
562	Miscellaneous wholesale, nondurable goods	374	207,384	7,732	7,732	3.7	3.7
571	Not specified wholesale trade	15	6,529	0	0	0.0	0.0
	RETAIL TRADE	29,880	17,095,416	1,133,336	1,255,224	6.6	7.3
580	Lumber and building material retailing	782	444,861	16,546	25,119	3.7	5.6
581	Hardware stores	328	179,280	2,571	4,755	1.4	2.7
582	Retail nurseries and garden stores	123	72,826	0	313	0.0	0.4
590	Mobile home dealers	32	18,132	0	0	0.0	0.0
591	Department stores	3,513	2,043,236	104,121	120,406	5.1	5.9
592	Variety stores	241	132,137	2,777	5,052	2.1	3.8
600	Miscellaneous general merchandise stores	196	99,242	3,221	3,884	3.2	3.9
601	Grocery stores	4,822	2,730,342	723,058	757,182	26.5	27.7
602	Dairy products stores	88	45,976	2,792	3,273	6.1	7.1
610	Retail bakeries	222	126,536	9,598	10,730	7.6	8.5
611	Food stores, n.e.c.	231	134,695	5,912	6,474	4.4	4.8
612	Motor vehicle dealers	1,604	934,169	35,822	39,680	3.8	4.2
620	Auto and home supply stores	636	379,930	7,654	13,395	2.0	3.5
621	Gasoline service stations	677	369,777	1,921	3,756	0.5	1.0
622	Miscellaneous vehicle dealers	143	80,415	2,472	2,472	3.1	3.1
630	Apparel and accessory stores, exc. shoe	1,272	746,218	18,159	22,840	2.4	3.1
631	Shoe stores	238	137,339	2,474	4,166	1.8	3.0
632	Furniture and home furnishings stores	697	428,907	11,338	13,624	2.6	3.2
640	Household appliances, TV, and radio stores	718	432,246	6,689	10,558	1.5	2.4
641	Eating and drinking places	9,292	5,285,007	103,460	117,037	2.0	2.2
642	Drug stores	926	522,285	25,580	32,098	4.9	6.1
650	Liquor stores	184	103,183	5,983	6,476	5.8	6.3
651	Sporting goods, bicycles, and hobby stores	437	247,639	8,933	9,348	3.6	3.8
652	Book and stationery stores	305	162,815	3,454	5,742	2.1	3.5
660	Jewelry stores	222	122,829	724	724	0.6	0.6
661	Sewing, needlework, and piece goods stores	90	44,229	0	0	0.0	0.0
662	Mail order houses	177	116,653	6,746	6,746	5.8	5.8
670	Vending machine operators	108	62,125	7,192	7,782	11.6	12.5
671	Direct selling establishments	162	95,749	584	1,803	0.6	1.9
672	Fuel and ice dealers	192	103,393	7,427	9,716	7.2	9.4
681	Retail florists	248	135,586	0	688	0.0	0.5
682	Miscellaneous retail stores	945	541,368	6,129	9,384	1.1	1.7
691	Not specified retail trade	29	16,291	0	0	0.0	0.0
	FINANCE, INSURANCE, AND REAL ESTATE	11,973	6,915,442	216,940	281,738	3.1	4.1
700	Banking	3,602	2,012,039	34,956	53,780	1.7	2.7
701	Savings and loan associations	200	112,194	4,500	4,788	4.0	4.3
702	Credit agencies, n.e.c.	919	519,522	14,193	15,766	2.7	3.0
710	Security, commodity brokerage, and investment companies	894	529,319	9,884	12,771	1.9	2.4
711	Insurance	3,737	2,168,312	60,485	92,187	2.8	4.3
712	Real estate, including real estate-insurance-law offices	2,621	1,574,058	92,922	102,445	5.9	6.5
	BUSINESS AND REPAIR SERVICES	9,347	5,596,223	235,332	283,894	4.2	5.1
721	Advertising	328	189,843	7,685	7,685	4.0	4.0
722	Services to dwellings and other buildings	935	564,096	55,389	63,692	9.8	11.3
730	Commercial research, development, and testing labs	526	266,588	14,630	17,187	5.5	6.4
731	Personnel supply services	988	597,181	11,755	20,425	2.0	3.4
732	Business management and consulting services	675	394,950	7,205	8,747	1.8	2.2
740	Computer and data processing services	1,147	728,320	9,377	14,083	1.3	1.9
741	Detective and protective services	604	386,192	30,505	38,053	7.9	9.9
742	Business services, n.e.c.	1,814	1,078,941	27,822	34,443	2.6	3.2
750	Automotive services, exc. repair	577	349,704	26,007	29,645	7.4	8.5
751	Automotive repair shops	1,088	644,661	11,615	14,556	1.8	2.3
752	Electrical repair shops	146	91,810	10,326	10,326	11.2	11.2
760	Miscellaneous repair services	519	303,938	23,016	25,053	7.6	8.2
	PERSONAL SERVICES	6,416	3,554,548	167,424	184,053	4.7	5.2
761	Private households	1,698	999,142	2,172	2,693	0.2	0.3
762	Hotels and motels	2,566	1,304,147	130,295	138,995	10.0	10.7
770	Lodging places, exc. hotels and motels	185	109,800	1,763	2,131	1.6	1.9
771	Laundry, cleaning, and garment services	621	359,263	22,653	25,729	6.3	7.2
772	Beauty shops	770	447,919	5,271	7,695	1.2	1.7
780	Barber shops	46	30,087	2,704	2,704	9.0	9.0
781	Funeral service and crematories	109	63,087	1,191	1,191	1.9	1.9
782	Shoe repair shops	6	3,319	512	512	15.4	15.4
790	Dressmaking shops	2	681	0	0	0.0	0.0
791	Miscellaneous personal services	413	237,104	863	2,404	0.4	1.0
	ENTERTAINMENT AND RECREATION SERVICES	2,294	1,310,801	151,825	178,766	11.6	13.6
800	Theaters and motion pictures	531	315,754	58,290	62,851	18.5	19.9
801	Bowling alleys, billiard and pool parlors	99	60,993	2,409	3,005	4.0	4.9
802	Miscellaneous entertainment and recreation services	1,664	934,054	91,125	112,909	9.8	12.1
831	HOSPITALS	8,730	4,837,816	685,804	834,476	14.2	17.2
	MEDICAL SERVICES, EXCEPT HOSPITALS	7,698	4,335,041	351,824	406,717	8.1	9.4
812	Offices of physicians	1,424	813,597	9,054	12,360	1.1	1.5
820	Offices of dentists	775	431,943	4,970	8,559	1.2	2.0
821	Offices of chiropractors	113	70,146	0	1,084	0.0	1.5
822	Offices of optometrists	81	46,017	0	0	0.0	0.0
830	Offices of health practitioners, n.e.c.	67	39,903	534	1,091	1.3	2.7
832	Nursing and personal care facilities	2,953	1,629,166	196,370	216,652	12.1	13.3
840	Health services, n.e.c.	2,285	1,304,269	140,896	166,972	10.8	12.8
	EDUCATIONAL SERVICES	16,565	9,032,567	3,109,614	3,718,357	34.4	41.2
842	Elementary and secondary schools	11,130	6,094,929	2,729,843	3,212,266	44.8	52.7
850	Colleges and universities	4,799	2,584,187	339,854	456,356	13.2	17.7
851	Business, trade, and vocational schools	119	65,842	4,737	6,198	7.2	9.4
852	Libraries	313	176,838	26,028	29,645	14.7	16.8
860	Educational services, n.e.c.	204	110,770	9,151	13,891	8.3	12.5
	SOCIAL SERVICES	3,704	2,032,400	182,340	216,871	9.0	10.7
861	Job training and vocational rehabilitation services	409	210,817	11,704	14,221	5.6	6.7
862	Child day care services	1,045	570,700	19,692	23,591	3.5	4.1
870	Residential care facilities, without nursing	672	370,337	21,285	26,485	5.7	7.2
871	Social services, n.e.c.	1,578	880,546	129,658	152,575	14.7	17.3
	OTHER PROFESSIONAL SERVICES	6,364	3,551,378	118,339	154,042	3.3	4.3
841	Legal services	1,634	918,215	11,562	18,252	1.3	2.0
872	Museums, art galleries, and zoos	178	86,825	2,749	4,231	3.2	4.9
880	Religious organizations	1,362	746,651	6,009	9,228	0.8	1.2
881	Membership organizations	897	476,768	66,381	69,747	13.9	14.6
882	Engineering, architectural, and surveying services	1,186	694,359	14,931	25,189	2.2	3.6
890	Accounting, auditing, and bookkeeping services	797	448,640	7,311	11,332	1.6	2.5
891	Noncommercial educational and scientific research	248	143,802<