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Statistics on Precincts and MCD-Groups

The ROAD Project's MCD Group data include

1 state merged at the Census blockgroup level (California).
13 states merged at the MCD level (Connecticut, Illinois, Indiana, Massachusetts, Maine, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, Wisconsin).
26 states merged at conglomerations of one or more MCDs (Alabama, Arkansas, Arizona, Colorado, Florida, Georgia, Iowa, Idaho, Kansas, Louisiana, Maryland, Michigan, Minnesota, Missouri, North Carolina, North Dakota, Nebraska, Nevada, Oklahoma, South Carolina, South Dakota, Tennessee, Utah, Virginia, Washington, West Virginia).
9 states merged at the county level (DE, HI, KY, MS, MT, NM, OR, TX, WY). Of these, 4 (KY, MS, MT, OR) did not participate at all in the Census PL94-171 project; 1 (TX) did only partially, such that no single county was capable of supporting more than one MCD Group; and 4 (DE, NM, WY, HI) coincidentally had VTD definitions that overlapped MCDs to such an extent in every county that no nontrivial MCD Groups were possible.
1 state (Alaska) and the District of Columbia, merged at the state level.

Note that our definition of MCD Groups could theoretically differ across years. We sought to avoid this wherever possible. However, for two states (South Carolina and West Virginia), we performed MCD Group-level merges differently for 1984 than for 1986-1990 because the 1984 precinct-level electoral data precincts were substantially different than the 1986-1990 precinct-level electoral data precinct definitions. To use the same MCD Grouping for 1986-1990 as for 1984 would have unnecessarily limited the number of MCD Groups. For the other states, there was no consequential difference across years, so we used the same MCD Group definitions.

Finally, we present a table showing the number of counties, MCD Groups, MCDs, and VTDs in each state.

Numbers of Units at Each Census Geographical Level (Recall that we provide data at the MCD Group (MCDGRP) and Precinct level.)

PRECINCTS

STATE COUNTIES MCDGRPs MCDs 1984 1986 1988 1990

AK 25 1 41 * 469 465 465

AL 67 82 391 3850 3689 3273 3271

AR 75 1010 1336 2966 3033 2897 2998

AZ 15 19 79 1438 1902 1944 1967

CA 58 21200 ** ** ** ** **

CO 63 71 1928 2858 2897 2998 3041

CT 8 169 169 827 811 815 824

DC 1 1 2 154 153 157 157

DE 3 3 28 337 338 340 345

FL 67 81 294 4492 4527 4668 4793

GA 159 175 582 3322 3395 3377 3440

HI 5 5 45 338 347 352 399

IA 99 1184 1657 2692 2684 2681 2660

ID 44 47 171 887 885 875 882

IL 102 1680 1680 11780 11778 11986 12203

IN 92 1566 1566 4754 4835 4955 5367

KS 105 1463 1546 3219 3277 3269 3247

KY 120 120 476 3533 3541 3453 3472

LA 64 89 630 3244 3317 3336 3341

MA 14 351 351 2201 2194 2144 2137

MD 24 58 299 1554 1641 1623 1676

ME 16 551 551 747 760 715 740

MI 83 1421 1526 7052 6865 6957 6806

MN 87 2668 2743 4070 4063 4089 4090

MO 115 1097 1369 4312 3941 4414 3924

MS 82 82 411 2408 2450 2404 2344

MT 57 57 194 965 971 969 947

NC 100 386 2575 2682 2688 2670 2714

ND 53 391 1807 1241 1241 1237 1041

NE 93 980 1256 2027 2021 2025 2018

NH 10 280 280 453 453 452 460

NJ *** 21 599 599 6412 6580 6573 6507

NM 33 33 132 1279 1349 1354 1440

NV 17 32 68 796 878 1057 1140

NY 62 1033 1033 14624 14937 15181 15084

OH 88 1553 1553 14058 13885 13961 13859

OK 77 99 2347 2470 2500 2478 2499

OR 36 36 212 2463 2533 2452 2442

PA 67 2674 2674 9739 9685 9687 9507

RI 5 39 39 538 530 542 691

SC, 1986-1990 46 75 295 2969 2718 3292 2636

SC, 1984 46 72 295 2969 2718 3292 2636

SD 66 660 1390 1294 1420 1162 1107

TN 95 122 463 2516 2524 2486 2557

TX 254 254 864 6643 6844 6967 7238

UT 29 33 91 1918 1943 1705 1688

VA *** 136 262 501 1959 1977 2021 2253

VT 14 255 255 295 290 290 290

WA 39 43 246 6229 6296 6770 6814

WI 71 1956 1956 3454 3475 3511 3537

WV, 1986-1990 55 101 278 2646 2509 2518 2407

WV, 1984 55 85 278 2646 2509 2518 2407

WY 23 23 72 467 470 470 477

TOTAL 3241 47327 41624 168787 169736 171827 170985

NOTES

				PRECINCTS
STATE	COUNTIES	MCDGRPs	MCDs	1984	1986	1988	1990
AK	25	1	41	*	469	465	465
AL	67	82	391	3850	3689	3273	3271
AR	75	1010	1336	2966	3033	2897	2998
AZ	15	19	79	1438	1902	1944	1967
CA	58	21200	**	**	**	**	**
CO	63	71	1928	2858	2897	2998	3041
CT	8	169	169	827	811	815	824
DC	1	1	2	154	153	157	157
DE	3	3	28	337	338	340	345
FL	67	81	294	4492	4527	4668	4793
GA	159	175	582	3322	3395	3377	3440
HI	5	5	45	338	347	352	399
IA	99	1184	1657	2692	2684	2681	2660
ID	44	47	171	887	885	875	882
IL	102	1680	1680	11780	11778	11986	12203
IN	92	1566	1566	4754	4835	4955	5367
KS	105	1463	1546	3219	3277	3269	3247
KY	120	120	476	3533	3541	3453	3472
LA	64	89	630	3244	3317	3336	3341
MA	14	351	351	2201	2194	2144	2137
MD	24	58	299	1554	1641	1623	1676
ME	16	551	551	747	760	715	740
MI	83	1421	1526	7052	6865	6957	6806
MN	87	2668	2743	4070	4063	4089	4090
MO	115	1097	1369	4312	3941	4414	3924
MS	82	82	411	2408	2450	2404	2344
MT	57	57	194	965	971	969	947
NC	100	386	2575	2682	2688	2670	2714
ND	53	391	1807	1241	1241	1237	1041
NE	93	980	1256	2027	2021	2025	2018
NH	10	280	280	453	453	452	460
NJ ***	21	599	599	6412	6580	6573	6507
NM	33	33	132	1279	1349	1354	1440
NV	17	32	68	796	878	1057	1140
NY	62	1033	1033	14624	14937	15181	15084
OH	88	1553	1553	14058	13885	13961	13859
OK	77	99	2347	2470	2500	2478	2499
OR	36	36	212	2463	2533	2452	2442
PA	67	2674	2674	9739	9685	9687	9507
RI	5	39	39	538	530	542	691
SC, 1986-1990	46	75	295	2969	2718	3292	2636
SC, 1984	46	72	295	2969	2718	3292	2636
SD	66	660	1390	1294	1420	1162	1107
TN	95	122	463	2516	2524	2486	2557
TX	254	254	864	6643	6844	6967	7238
UT	29	33	91	1918	1943	1705	1688
VA ***	136	262	501	1959	1977	2021	2253
VT	14	255	255	295	290	290	290
WA	39	43	246	6229	6296	6770	6814
WI	71	1956	1956	3454	3475	3511	3537
WV, 1986-1990	55	101	278	2646	2509	2518	2407
WV, 1984	55	85	278	2646	2509	2518	2407
WY	23	23	72	467	470	470	477
TOTAL	3241	47327	41624	168787	169736	171827	170985

*: No precinct level data are available for Alaska in 1984.
**: Since California is merged at the Census blockgroup level, a lower level of aggregation than precinct, there are no precinct level data for this state.
***: For New Jersey and Virginia, off year electoral data are available. The precinct counts in 1985, 1987, and 1989 for New Jersey are 6632, 6575, and 6582 and for Virginia are 2110, 2140, and 2182.