Reapportionment Act limits House to 435 seats.
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Federal Census Info (and some Oregon History)

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Year Census
date
StatesU.S.A. Pop. U.S. Census Director Oregon
Pop.
Wash.
Pop.
Idaho
Pop.
New States
2010Apr 0150308,745,538Robert Martin Groves3,831,0746,724,5401,567,582
2000Apr 0150281,421,906Kenneth Prewitt3,421,3995,894,1211,293,953
1990Apr 0150248,709,873Barbara Everitt Bryant2,842,3214,866,6921,006,749
1980Apr 0150226,542,199Vincent Barabba2,633,1564,132,353944,127
1971Jul 01 26th Amendment lowers voting age to 18.
1970Dec 21 Oregon v. Mitchell decided by Supreme Court.
1970Apr 0150203,302,031George Hay Brown2,091,5333,413,244713,015
1960Apr 0150179,323,175Robert Wilbur Burgess1,768,6872,853,214667,191AK, HI
1959Feb 24 15th Amendment belatedly ratified by Oregon.
1950Apr 0148151,325,798Roy Victor Peel1,521,3412,378,963588,637
1940Apr 0148132,164,569William Lane Austin1,089,6841,736,191524,873
1930Apr 0148123,202,624William Mott Steuart953,7861,563,396445,032
1920Jan 0148106,021,537Samuel Lyle Rogers783,3891,356,621431,866NM, AZ
1910Apr 154692,228,496Edward Dana Durand672,7651,141,990325,594OK
1900Jun 014576,212,168William Rush Merriam413,536518,103161,772ID, WY, UT
1890Jul 03 Idaho became 43rd state.
1890Jun 014262,979,766Robert Percival Porter317,704357,23288,548ND, SD, MT, WA
1889Nov 11 Washington became 42nd state.
1880Jun 013850,189,209Francis Amasa Walker174,76875,11632,610CO
1870Jun 013738,558,371Francis Amasa Walker90,92323,95514,999KS, WV, NV, NE
1863Mar 04 Territory of Idaho formed.
1860Jun 013331,443,321Joseph C. G. Kennedy52,46511,594CA, MN, OR
1859Feb 14 Oregon became 33rd state.
1853Mar 02 Washington Territory formed.
1850Jun 013023,191,876Joseph C. G. Kennedy12,093Territorial countsFL, TX, IA, WI
1848Aug 14 Oregon Territory formed.
1847Nov 29 Whitman massacre.
1846Jun 15 Oregon Treaty signed in Washington, D.C.
1843May 2 Provisional Government of Oregon formed.
1840Jun 012617,063,353William Augustus WeaverAR, MI
1830Jun 012412,860,702Martin Van BurenMO
1820Aug 07239,638,453John Quincy AdamsLA, IN, MS, IL, AL, ME
1810Aug 06177,239,881Robert SmithOH
1800Aug 04165,308,483John MarshallVT, KY, TN
1790Aug 02133,929,214Thomas JeffersonDE, PA, NJ, GA, CT, MA, MD, SC, NH, VA, NY, NC, RI