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Historical Apportionment Data (1910-2020)

Apportionment is the process of dividing the 435 memberships, or seats, in the House of Representatives among the 50 states based on the population figures collected during the decennial census.

State or Region 2020 Census 2010 Census 2000 Census 1990 Census 1980 Census 1970 Census 1960 Census 1 1950 Census 1940 Census 1930 Census 1920 Census 2 1910 Census 3
X Not applicable. Represents date prior to becoming a state.

Note 1: Apportionment is the process of dividing up the number of representatives (or seats) in the U.S. House of Representatives among the 50 states. The District of Columbia and Puerto Rico are not included.

Note 2: The values for the "United States" that are shown in the "Change in Seats" row indicate the total number of seats that were reassigned that decade (except for the 1910 value, which indicates the number of seats added to the U.S. House of Representatives since 1900).

1 In 1959, Alaska and Hawaii became states and were each granted a seat—temporarily increasing the size of the House to 437. The size of the House for the 1960 apportionment reverted back to the fixed size of 435 seats.
2 In 1912, Arizona and New Mexico became states and each were granted a seat—temporarily increasing the size of the House to 435. In 1920, the Census Bureau did transmit apportionment counts to Congress, but Congress did not reapportion. The size of the House during the next apportionment, in 1930, was fixed at 435.
3 In 1900, there were 386 seats in the House. In 1907, Oklahoma became a state and was granted 5 seats—temporarily increasing the size of the House to 391. The size of the House during the next apportionment, in 1910, was increased to 433.

United States
Number of Seats 435 435 435 435 435 435 435 435 435 435 435 433
Change in Seats 7 12 12 19 17 11 21 14 9 27 0 47
Average Population Per Seat 761,169 710,767 646,952 572,466 519,235 469,088 410,481 344,587 301,164 280,675 241,864 210,328
Alabama
Number of Seats 7 7 7 7 7 7 8 9 9 9 10 10
Change in Seats 0 0 0 0 0 -1 -1 0 0 -1 0 1
Average Population Per Seat 718,579 686,140 637,304 580,373 555,723 496,555 408,343 340,194 314,773 294,027 234,817 213,809
Alaska
Number of Seats 1 1 1 1 1 1 1 X X X X X
Change in Seats 0 0 0 0 0 0 1 X X X X X
Average Population Per Seat 736,081 721,523 628,933 551,947 400,481 304,067 226,167 X X X X X
Arizona
Number of Seats 9 9 8 6 5 4 3 2 2 1 1 X
Change in Seats 0 1 2 1 1 1 1 0 1 1 1 X
Average Population Per Seat 795,436 712,522 642,585 612,998 543,573 446,905 434,054 374,794 249,631 389,375 309,495 X
Arkansas
Number of Seats 4 4 4 4 4 4 4 6 7 7 7 7
Change in Seats 0 0 0 0 0 0 -2 -1 0 0 0 0
Average Population Per Seat 753,439 731,557 669,933 590,560 571,378 485,576 446,568 318,252 278,484 264,921 250,315 224,921
California
Number of Seats 52 53 53 52 45 43 38 30 23 20 11 11
Change in Seats -1 0 1 7 2 5 8 7 3 9 0 3
Average Population Per Seat 761,091 704,566 640,204 573,832 525,968 467,415 413,611 352,874 300,321 283,412 311,457 216,051
Colorado
Number of Seats 8 7 7 6 6 5 4 4 4 4 4 4
Change in Seats 1 0 1 0 1 1 0 0 0 0 0 1
Average Population Per Seat 722,771 720,704 615,983 551,319 481,472 445,354 438,487 331,272 280,824 258,712 234,790 199,643
Connecticut
Number of Seats 5 5 5 6 6 6 6 6 6 6 5 5
Change in Seats 0 0 -1 0 0 0 0 0 0 1 0 0
Average Population Per Seat 721,660 716,326 681,907 549,278 517,929 508,449 422,539 334,547 284,874 267,816 276,126 222,951
Delaware
Number of Seats 1 1 1 1 1 1 1 1 1 1 1 1
Change in Seats 0 0 0 0 0 0 0 0 0 0 0 0
Average Population Per Seat 990,837 900,877 785,068 668,696 595,225 551,928 446,292 318,085 266,505 238,380 223,003 202,322
Florida
Number of Seats 28 27 25 23 19 15 12 8 6 5 4 4
Change in Seats 1 2 2 4 4 3 4 2 1 1 0 1
Average Population Per Seat 770,376 700,029 641,156 565,364 512,631 457,047 412,630 346,413 316,236 293,638 242,118 188,155
Georgia
Number of Seats 14 14 13 11 10 10 10 10 10 10 12 12
Change in Seats 0 1 2 1 0 0 0 0 0 -2 0 1
Average Population Per Seat 766,091 694,826 631,306 591,674 546,427 462,731 394,312 344,458 312,372 290,845 241,319 217,427
Hawaii
Number of Seats 2 2 2 2 2 2 2 X X X X X
Change in Seats 0 0 0 0 0 0 2 X X X X X
Average Population Per Seat 730,069 683,431 608,321 557,637 482,500 392,451 316,386 X X X X X
Idaho
Number of Seats 2 2 2 2 2 2 2 2 2 2 2 2
Change in Seats 0 0 0 0 0 0 0 0 0 0 0 1
Average Population Per Seat 920,689 786,750 648,637 505,993 471,968 359,961 333,596 294,319 262,437 220,768 215,221 161,720
Illinois
Number of Seats 17 18 19 20 22 24 24 25 26 27 27 27
Change in Seats -1 -1 -1 -2 -2 0 -1 -1 -1 0 0 2
Average Population Per Seat 754,279 714,688 654,686 573,334 519,021 466,013 420,048 348,487 303,740 282,607 240,196 208,837
Indiana
Number of Seats 9 9 9 10 10 11 11 11 11 12 13 13
Change in Seats 0 0 -1 0 -1 0 0 0 -1 -1 0 0
Average Population Per Seat 754,476 722,398 676,754 556,423 549,018 475,287 423,863 357,657 311,618 269,873 225,415 207,760
Iowa
Number of Seats 4 4 5 5 6 6 7 8 8 9 11 11
Change in Seats 0 -1 0 -1 0 -1 -1 0 -1 -2 0 0
Average Population Per Seat 798,102 763,447 586,385 557,485 485,565 474,487 393,934 327,634 317,284 274,491 218,547 202,252
Kansas
Number of Seats 4 4 4 4 5 5 5 6 6 7 8 8
Change in Seats 0 0 0 -1 0 0 -1 0 -1 -1 0 0
Average Population Per Seat 735,216 715,953 673,456 621,400 472,642 453,169 435,722 317,550 300,171 268,500 221,157 211,369
Kentucky
Number of Seats 6 6 6 6 7 7 7 8 9 9 11 11
Change in Seats 0 0 0 -1 0 0 -1 -1 0 -2 0 0
Average Population Per Seat 751,557 725,101 674,905 616,495 523,062 463,783 434,022 368,101 316,181 290,508 219,694 208,173
Louisiana
Number of Seats 6 6 7 7 8 8 8 8 8 8 8 8
Change in Seats 0 -1 0 -1 0 0 0 0 0 0 0 1
Average Population Per Seat 776,911 758,994 640,039 605,459 525,497 459,001 407,128 335,440 295,485 262,699 224,814 207,049
Maine
Number of Seats 2 2 2 2 2 2 2 3 3 3 4 4
Change in Seats 0 0 0 0 0 0 -1 0 0 -1 0 0
Average Population Per Seat 681,791 666,537 638,866 616,612 562,330 503,160 484,633 304,591 282,409 265,806 192,004 185,593
Maryland
Number of Seats 8 8 8 8 8 8 8 7 6 6 6 6
Change in Seats 0 0 0 0 0 0 1 1 0 0 0 0
Average Population Per Seat 773,160 723,741 663,486 599,828 527,056 494,212 387,586 334,714 303,541 271,920 241,610 215,891
Massachusetts
Number of Seats 9 9 10 10 11 12 12 14 14 15 16 16
Change in Seats 0 -1 0 -1 -1 0 -2 0 -1 -1 0 2
Average Population Per Seat 781,497 728,849 635,557 602,905 521,549 477,223 429,048 335,037 308,337 283,307 240,772 210,401
Michigan
Number of Seats 13 14 15 16 18 19 19 18 17 17 13 13
Change in Seats -1 -1 -1 -2 -1 0 1 1 0 4 0 1
Average Population Per Seat 775,726 707,973 663,722 583,049 514,352 470,379 411,747 353,987 309,183 284,827 282,186 216,167
Minnesota
Number of Seats 8 8 8 8 8 8 8 9 9 9 10 10
Change in Seats 0 0 0 0 0 0 -1 0 0 -1 0 1
Average Population Per Seat 713,719 664,360 615,709 548,379 509,644 479,147 426,733 331,387 310,256 283,509 238,566 207,438
Mississippi
Number of Seats 4 4 4 5 5 5 5 6 7 7 8 8
Change in Seats 0 0 -1 0 0 0 -1 -1 0 -1 0 0
Average Population Per Seat 740,979 744,560 713,232 517,289 504,128 446,770 435,628 363,152 311,971 286,879 223,827 224,639
Missouri
Number of Seats 8 8 9 9 9 10 10 11 13 13 16 16
Change in Seats 0 -1 0 0 -1 0 -1 -2 0 -3 0 0
Average Population Per Seat 770,035 751,435 622,918 570,867 546,383 471,803 431,981 359,514 291,128 279,162 212,753 205,833
Montana
Number of Seats 2 1 1 1 2 2 2 2 2 2 2 2
Change in Seats 1 0 0 -1 0 0 0 0 0 0 0 1
Average Population Per Seat 542,704 994,416 905,316 803,655 393,345 350,787 337,384 295,512 279,728 262,365 270,756 183,169
Nebraska
Number of Seats 3 3 3 3 3 3 3 4 4 5 6 6
Change in Seats 0 0 0 0 0 0 -1 0 -1 -1 0 0
Average Population Per Seat 654,444 610,608 571,790 528,206 523,335 498,940 470,443 331,378 328,959 275,025 216,062 198,702
Nevada
Number of Seats 4 4 3 2 2 1 1 1 1 1 1 1
Change in Seats 0 1 1 0 1 0 0 0 0 0 0 0
Average Population Per Seat 777,116 677,358 667,344 603,076 399,592 492,396 285,278 160,083 110,247 86,390 75,820 80,293
New Hampshire
Number of Seats 2 2 2 2 2 2 2 2 2 2 2 2
Change in Seats 0 0 0 0 0 0 0 0 0 0 0 0
Average Population Per Seat 689,545 660,723 619,208 556,958 460,305 373,142 303,461 266,621 245,762 232,646 221,542 215,286
New Jersey
Number of Seats 12 12 13 13 14 15 15 14 14 14 12 12
Change in Seats 0 -1 0 -1 -1 0 1 0 0 2 0 2
Average Population Per Seat 774,541 733,958 648,027 596,049 526,011 480,536 404,452 345,381 297,155 288,666 262,992 211,431
New Mexico
Number of Seats 3 3 3 3 3 2 2 2 2 1 1 X
Change in Seats 0 0 0 0 1 0 0 0 1 1 1 X
Average Population Per Seat 706,740 689,091 607,940 507,260 433,323 513,332 475,512 340,594 265,909 395,982 353,428 X
New York
Number of Seats 26 27 29 31 34 39 41 43 45 45 43 43
Change in Seats -1 -2 -2 -3 -5 -2 -2 -2 0 2 0 6
Average Population Per Seat 777,529 719,298 655,344 582,081 516,391 470,207 409,324 344,888 299,536 279,733 241,409 211,836
North Carolina
Number of Seats 14 13 13 12 11 11 11 12 12 11 10 10
Change in Seats 1 0 1 1 0 0 -1 0 1 1 0 0
Average Population Per Seat 746,711 735,829 620,590 554,803 534,039 465,930 414,196 338,494 297,635 287,934 255,912 220,629
North Dakota
Number of Seats 1 1 1 1 1 1 2 2 2 2 3 3
Change in Seats 0 0 0 0 0 -1 0 0 0 -1 0 1
Average Population Per Seat 779,702 675,905 643,756 641,364 652,695 624,181 316,223 309,818 320,968 336,670 214,651 191,468
Ohio
Number of Seats 15 16 18 19 21 23 24 23 23 24 22 22
Change in Seats -1 -2 -1 -2 -2 -1 1 0 -1 2 0 1
Average Population Per Seat 787,257 723,031 631,919 573,017 514,163 466,530 404,433 345,506 300,331 276,943 261,791 216,687
Oklahoma
Number of Seats 5 5 5 6 6 6 6 6 8 9 8 8
Change in Seats 0 0 -1 0 0 0 0 -2 -1 1 0 8
Average Population Per Seat 792,703 752,976 691,764 526,267 504,211 430,914 388,047 372,225 292,054 264,691 253,535 207,144
Oregon
Number of Seats 6 5 5 5 5 4 4 4 4 3 3 3
Change in Seats 1 0 0 0 1 0 0 0 1 0 0 1
Average Population Per Seat 706,917 769,721 685,709 570,747 526,533 527,703 442,172 380,335 272,421 316,793 261,130 224,255
Pennsylvania
Number of Seats 17 18 19 21 23 25 27 30 33 34 36 36
Change in Seats -1 -1 -2 -2 -2 -2 -3 -3 -1 -2 0 4
Average Population Per Seat 765,403 707,495 647,404 567,843 515,945 475,373 419,236 349,934 300,005 283,274 242,223 212,920
Rhode Island
Number of Seats 2 2 2 2 2 2 2 2 2 2 3 3
Change in Seats 0 0 0 0 0 0 0 0 0 -1 0 1
Average Population Per Seat 549,082 527,624 524,831 502,992 473,577 478,899 429,744 395,948 356,673 343,749 201,466 180,870
South Carolina
Number of Seats 7 7 6 6 6 6 6 6 6 6 7 7
Change in Seats 0 1 0 0 0 0 0 0 0 -1 0 0
Average Population Per Seat 732,102 663,711 670,844 584,285 519,868 436,220 397,099 352,838 316,634 289,793 240,532 216,486
South Dakota
Number of Seats 1 1 1 1 1 2 2 2 2 2 3 3
Change in Seats 0 0 0 0 -1 0 0 0 0 -1 0 1
Average Population Per Seat 887,770 819,761 756,874 699,999 690,178 336,624 340,257 326,370 321,481 336,503 210,413 191,892
Tennessee
Number of Seats 9 9 9 9 9 8 9 9 10 9 10 10
Change in Seats 0 0 0 0 1 -1 0 -1 1 -1 0 0
Average Population Per Seat 768,544 708,381 633,337 544,071 510,083 495,133 396,343 365,746 291,584 290,722 233,789 218,479
Texas
Number of Seats 38 36 32 30 27 24 23 22 21 21 18 18
Change in Seats 2 4 2 3 3 1 1 1 0 3 0 2
Average Population Per Seat 767,981 701,901 653,250 568,660 526,977 470,783 416,508 350,509 305,468 277,362 259,068 216,475
Utah
Number of Seats 4 4 3 3 3 2 2 2 2 2 2 2
Change in Seats 0 1 0 0 1 0 0 0 0 0 0 1
Average Population Per Seat 818,813 692,691 745,571 575,928 487,012 533,905 445,314 344,431 275,155 252,871 224,194 185,932
Vermont
Number of Seats 1 1 1 1 1 1 1 1 1 1 2 2
Change in Seats 0 0 0 0 0 0 0 0 0 -1 0 0
Average Population Per Seat 643,503 630,337 609,890 564,964 511,456 448,327 389,881 377,747 359,231 359,611 176,214 177,978
Virginia
Number of Seats 11 11 11 11 10 10 10 10 9 9 10 10
Change in Seats 0 0 0 1 0 0 0 1 0 -1 0 0
Average Population Per Seat 786,777 730,703 645,518 565,143 534,628 469,074 396,695 331,868 297,530 269,092 230,919 206,161
Washington
Number of Seats 10 10 9 9 8 7 7 7 6 6 5 5
Change in Seats 0 1 0 1 1 0 0 1 0 1 0 2
Average Population Per Seat 771,595 675,337 656,520 543,105 516,270 491,927 407,602 339,852 289,365 258,737 270,919 228,027
West Virginia
Number of Seats 2 3 3 3 4 4 5 6 6 6 6 6
Change in Seats -1 0 0 -1 0 -1 -1 0 0 0 0 1
Average Population Per Seat 897,523 619,938 604,359 600,542 487,411 440,833 372,084 334,259 316,996 288,200 243,950 203,520
Wisconsin
Number of Seats 8 8 8 9 9 9 10 10 10 10 11 11
Change in Seats 0 0 -1 0 0 -1 0 0 0 -1 0 0
Average Population Per Seat 737,184 712,279 671,401 545,194 522,815 494,113 395,178 343,458 313,759 293,172 239,210 212,078
Wyoming
Number of Seats 1 1 1 1 1 1 1 1 1 1 1 1
Change in Seats 0 0 0 0 0 0 0 0 0 0 0 0
Average Population Per Seat 577,719 568,300 495,304 455,975 470,816 335,719 330,066 290,529 250,742 223,630 193,487 144,658

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