County-Level Education Data for US

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		Percent completing less than high school (persons 25 and over)1
		Total				Urban2				Rural2
	Name	1970	1980	1990	2000	1970	1980	1990	2000	1970	1980	1990	2000
1	United States	47.7	33.5	24.8	19.6	45.7	31.6	23.3	18.8	56.0	41.8	31.4	23.5
2	Alabama	58.7	43.5	33.1	24.7	55.4	39.9	29.9	22.2	66.1	51.6	40.9	30.7
3	Alaska	33.3	17.5	13.4	11.7	24.9	12.5	10.0	9.7	45.2	25.5	19.0	15.2
4	Arizona	41.9	27.6	21.3	19.0	40.5	26.3	20.0	18.2	51.9	37.2	31.8	25.7
5	Arkansas	60.1	44.5	33.7	24.7	53.5	38.6	28.7	21.1	66.5	50.9	39.5	29.3
6	California	37.4	26.5	23.8	23.2	37.2	26.6	23.9	23.3	43.5	25.3	21.9	17.8
7	Colorado	36.1	21.4	15.6	13.1	33.8	20.0	14.6	12.5	47.1	28.5	21.4	16.5
8	Connecticut	44.0	29.7	20.8	16.0	43.5	29.3	20.6	16.0	49.9	33.4	22.6	16.4
9	Delaware	45.4	31.4	22.5	17.4	43.2	28.9	20.8	15.7	57.0	42.9	30.3	23.5
10	District of Columbia	44.8	32.9	26.9	22.2	44.8	32.9	26.9	22.2
11	Florida	47.4	33.3	25.6	20.1	46.6	32.6	25.0	19.7	60.6	44.7	34.1	26.5
12	Georgia	59.4	43.6	29.1	21.4	54.6	39.0	25.5	18.9	72.5	57.6	41.9	31.3
13	Hawaii	38.1	26.2	19.9	15.4	34.0	24.4	18.8	15.2	54.8	32.5	23.4	16.1
14	Idaho	40.5	26.3	20.3	15.3	37.7	24.1	18.5	13.7	43.9	29.2	22.9	17.9
15	Illinois	47.4	33.5	23.8	18.6	46.5	32.5	23.1	18.3	52.1	38.7	27.5	20.0
16	Indiana	47.1	33.6	24.4	17.9	46.3	32.5	23.2	16.9	49.5	37.1	28.2	20.9
17	Iowa	41.0	28.5	19.9	13.9	36.9	24.7	17.2	12.3	44.4	31.9	22.6	15.7
18	Kansas	40.1	26.7	18.7	14.0	37.4	23.6	16.2	12.2	43.2	30.3	22.3	16.8
19	Kentucky	61.5	46.9	35.4	25.9	54.1	38.6	27.5	19.2	70.5	56.7	45.2	34.3
20	Louisiana	57.8	42.3	31.7	25.2	54.2	38.7	28.7	22.7	67.2	52.5	40.5	32.6
21	Maine	45.3	31.3	21.2	14.6	43.5	30.2	19.7	13.2	47.4	32.8	23.1	16.6
22	Maryland	47.7	32.6	21.6	16.2	47.0	31.9	21.2	16.0	62.1	44.4	28.1	18.9
23	Massachusetts	41.5	27.8	20.0	15.2	41.6	27.8	20.0	15.3	33.3	16.1	10.0	9.1
24	Michigan	47.2	32.0	23.2	16.6	46.9	31.7	22.9	16.5	49.0	33.6	24.7	17.1
25	Minnesota	42.4	26.9	17.6	12.1	37.1	22.1	14.2	10.1	52.4	36.6	25.8	17.0
26	Mississippi	59.0	45.2	35.7	27.1	50.3	36.6	28.4	21.0	63.5	50.3	40.6	31.7
27	Missouri	51.2	36.5	26.1	18.7	48.4	33.3	22.9	16.4	58.4	44.6	34.4	24.7
28	Montana	40.8	25.6	19.0	12.8	34.9	22.8	16.2	11.2	43.7	27.1	20.5	13.7
29	Nebraska	40.7	26.6	18.2	13.4	35.0	22.1	14.4	11.3	45.4	30.7	22.1	15.9
30	Nevada	34.8	24.5	21.2	19.3	33.4	24.0	21.1	19.6	42.0	27.9	21.8	17.5
31	New Hampshire	42.4	27.7	17.8	12.6	41.9	26.9	16.7	11.8	43.2	29.0	19.7	13.8
32	New Jersey	47.5	32.6	23.3	17.9	47.5	32.6	23.3	17.9
33	New Mexico	44.8	31.1	24.9	21.1	39.7	27.4	21.3	18.7	50.7	36.7	30.8	25.4
34	New York	47.3	33.7	25.2	20.9	47.3	33.6	25.1	21.0	48.2	35.7	25.9	20.0
35	North Carolina	61.5	45.2	30.0	21.9	57.8	41.1	26.4	19.2	67.9	52.4	37.1	27.3
36	North Dakota	49.7	33.6	23.3	16.1	39.4	24.6	15.9	11.3	54.0	38.2	28.0	19.7
37	Ohio	46.8	33.0	24.3	17.0	46.2	32.2	23.5	16.3	49.4	36.7	28.1	20.0
38	Oklahoma	48.4	34.0	25.4	19.4	43.4	29.2	21.8	17.1	54.6	40.6	31.0	23.2
39	Oregon	40.0	24.4	18.5	14.9	37.7	22.4	16.7	13.6	45.9	29.6	23.9	18.8
40	Pennsylvania	49.8	35.3	25.3	18.1	49.5	34.7	24.8	17.7	51.6	38.6	28.2	20.3
41	Rhode Island	53.6	38.9	28.0	22.0	53.6	38.9	28.0	22.0
42	South Carolina	62.2	46.3	31.7	23.7	59.1	43.7	29.3	21.8	70.0	53.5	38.9	29.1
43	South Dakota	46.7	32.1	22.9	15.4	39.6	25.5	17.7	12.0	49.8	35.5	26.2	17.8
44	Tennessee	58.2	43.8	32.9	24.1	53.8	39.3	28.9	21.1	69.0	54.8	43.3	31.8
45	Texas	52.6	37.4	27.9	24.3	49.9	34.5	26.0	23.3	62.9	50.1	37.7	30.4
46	Utah	32.7	20.0	14.9	12.3	31.6	19.0	14.0	11.8	39.7	25.9	20.5	15.6
47	Vermont	42.9	29.0	19.2	13.6	40.6	26.6	16.3	11.5	43.8	29.9	20.5	14.5
48	Virginia	52.2	37.6	24.8	18.5	48.0	33.0	21.5	16.0	68.8	56.5	41.6	31.7
49	Washington	36.5	22.4	16.2	12.9	35.7	21.6	15.4	12.3	41.9	27.4	21.6	16.9
50	West Virginia	58.4	44.0	34.0	24.8	53.8	39.5	29.9	21.3	63.4	48.9	38.7	28.9
51	Wisconsin	45.5	30.4	21.4	14.9	43.2	28.2	19.8	14.1	51.7	35.7	25.5	17.0
52	Wyoming	37.1	22.1	17.0	12.1	32.7	18.7	15.3	11.3	39.2	23.6	17.7	12.5

Download the State- and county-level data in Excel format.

¹For 1970 and 1980, the share of adults with less than high school includes those who had not completed the 12th grade. In 1990 and 2000, the share includes those who did not receive a high school diploma or its equivalent (such as a GED).

²Urban and rural (metro and nonmetro) defintions are based on the Office of Management and Budget (OMB) June 2003 classification. See Measuring Rurality: New Definitions in 2003 for more information.

Source: U.S. Census Bureau, 1970, 1980, 1990, and 2000 Census of Population.