United States congressional apportionment
List of apportionments
The size of the U.S. House of Representatives has increased and decreased as follows

United States congressional apportionment

Section Title: List of apportionments
Table Section Text: The size of the U.S. House of Representatives has increased and decreased as follows

Effective date	Size	Change	Legal provision	Reason and/or comments

March 4, 1789	59	n/a	Const. Art. I, § 2, cl. 3	Seats apportioned by the Constitution

November 21, 1789	64	5	North Carolina ratified the Constitution with the seats apportioned by the Constitution

May 29, 1790	65	1	Rhode Island ratified the Constitution with the seat apportioned by the Constitution

March 4, 1791	67	2	1 Stat. 191	Vermont admitted

June 1, 1792	69	2	Kentucky admitted

March 4, 1793	105	36	1 Stat. 253 (Apportionment Act of 1792)	Apportionment following the First Census

June 1, 1796	106	1	1 Stat. 491	Tennessee admitted

March 1, 1803	107	1	2 Stat. 175	Ohio admitted.

March 4, 1803	142	35	2 Stat. 128	Apportionment following the Second Census.

April 30, 1812	143	1	2 Stat. 703	Louisiana admitted.

March 4, 1813	182	39	2 Stat. 669	Apportionment following the Third Census.

December 11, 1816	183	1	3 Stat. 290	Indiana admitted.

December 10, 1817	184	1	3 Stat. 349	Mississippi admitted.

December 3, 1818	185	1	3 Stat. 430	Illinois admitted.

December 14, 1819	186	1	3 Stat. 492	Alabama admitted.

March 15, 1820	3 Stat. 555	Maine admitted, 7 seats transferred from Massachusetts

August 10, 1821	187	1	3 Stat. 547	Missouri admitted

March 4, 1823	213	26	3 Stat. 651	Apportionment following the Fourth Census

March 4, 1833	240	27	4 Stat. 516	Apportionment following the Fifth Census

June 15, 1836	241	1	5 Stat. 51	Arkansas admitted

January 26, 1837	242	1	5 Stat. 50	Michigan admitted

March 4, 1843	223	19	5 Stat. 491	Apportionment following the Sixth Census, the only time the size of the House was reduced, except for the minor readjustments in 1863 and 1963.

March 3, 1845	224	1	5 Stat. 743	Florida admitted.

December 29, 1845	226	2	5 Stat. 798	Texas annexed and admitted.

December 28, 1846	228	2	5 Stat. 743 9 Stat. 52	Iowa admitted.

May 29, 1848	230	2	9 Stat. 58 9 Stat. 235	Wisconsin admitted.

March 4, 1849	231	1	9 Stat. 235	Additional seat apportioned to Wisconsin.

September 9, 1850	233	2	9 Stat. 452	California admitted.

March 4, 1853	233	9 Stat. 432	Apportionment following the Seventh Census.

234	1	10 Stat. 25	Additional seat apportioned to California

May 11, 1858	236	2	11 Stat. 166	Minnesota admitted.

February 14, 1859	237	1	11 Stat. 383	Oregon admitted.

January 29, 1861	238	1	12 Stat. 126	Kansas admitted

June 2, 1862	239	1	12 Stat. 411	California apportioned an extra seat

March 4, 1863	233	6	9 Stat. 432	Apportionment following the Eighth Census, in accordance with the 1850 act, which provided for an apportionment of 233 seats

241	8	12 Stat. 353	Supplemental apportionment of 8 seats (1 each for Pennsylvania, Ohio, Kentucky, Illinois, Iowa, Minnesota, Vermont, and Rhode Island), for an overall increase of 2 seats in the 38th Congress

June 20, 1863	12 Stat. 633	West Virginia admitted, three seats transferred from Virginia

October 31, 1864	242	1	13 Stat. 32	Nevada admitted

March 1, 1867	243	1	14 Stat. 391	Nebraska admitted

March 4, 1873	283	40	17 Stat. 28	Apportionment following the Ninth Census, replacing the 1850 act

292	9	17 Stat. 192	Supplemental apportionment added one seat each for nine states

August 1, 1876	293	1	13 Stat. 34	Colorado admitted

March 4, 1883	325	32	22 Stat. 5	Apportionment following the Tenth Census.

November 2, 1889	328	3	25 Stat. 679	North and South Dakota admitted, with one and two seats respectively.

November 8, 1889	329	1	25 Stat. 679	Montana admitted.

November 11, 1889	330	1	25 Stat. 679	Washington admitted.

July 3, 1890	331	1	26 Stat. 215	Idaho admitted.

July 10, 1890	332	1	26 Stat. 222	Wyoming admitted.

March 4, 1893	356	24	26 Stat. 735	Apportionment following the Eleventh Census.

January 4, 1896	357	1	28 Stat. 109	Utah admitted.

March 4, 1903	386	29	31 Stat. 733	Apportionment following the Twelfth Census (1900)

November 16, 1907	391	5	34 Stat. 271	Oklahoma admitted

January 6, 1912	393	2	37 Stat. 39, incorporating 36 Stat. 557	New Mexico admitted

February 14, 1912	394	1	37 Stat. 39, incorporating 36 Stat. 557	Arizona admitted

March 4, 1913	435	41	37 Stat. 13 (Apportionment Act of 1911, §§1–2)	Apportionment following the Thirteenth Census (1910)

March 4, 1933	435	46 Stat. 26 (Reapportionment Act of 1929)	Apportionment following the Fifteenth Census (1930)

January 3, 1943	435	46 Stat. 26 (Reapportionment Act of 1929) 54 Stat. 162	Apportionment following the Sixteenth Census (1940)

January 3, 1953	435	55 Stat. 761	Apportionment following the Seventeenth Census

January 3, 1959	436	1	72 Stat. 345	Alaska admitted

August 21, 1959	437	1	73 Stat. 8, §8	Hawaii admitted

January 3, 1963	435	2	72 Stat. 345 73 Stat. 8 2 U.S.C. § 2a	Apportionment following the Eighteenth Census

January 3, 1973	435	2 U.S.C. § 2a	Apportionment following the Nineteenth Census

January 3, 1983	435	2 U.S.C. § 2a	Apportionment following the Twentieth Census

January 3, 1993	435	2 U.S.C. § 2a	Apportionment following the Twenty-First Census

January 3, 2003	435	2 U.S.C. § 2a	Apportionment following the Twenty-Second Census

January 3, 2013	435	2 U.S.C. § 2a	Apportionment following the Twenty-Third Census

Sentence(s)

United States congressional apportionment increased to 437 members upon the 1959 admission of Alaska and Hawaii.

final_sentence: United States congressional apportionment increased to 437 members upon the 1959 admission of Alaska and Hawaii.