Longest Interval Between Adding a New State

 The interval between adding each state, since the original 13.  We are presently in the longest interval ever, 61 years and counting.   The second longest was between Arizona and Alaska

Hawaii  21 Aug 1959  61 yrs 1 month before present

Alaska  3 Jan 1959 8 Months before Hawaii

Arizona 14 Feb 1912 46 yrs 11 mo before Alaska

New Mexico 3 Jan 1912 1 month before Arizona

Oklahoma 16 Nov 1907 8 yrs 1 month before New Mexico

Utah    4 Jan 1896   11 yrs 10 mo before Oklahoma

Wyoming 10 Jul 1890 5 yrs 5 mo before Utah

Idaho 3 Jul 1890 7 days before Wyoming

Washington 11 Nov 1889 10 yrs 9 months before Idaho

Montana 8 Nov 1889 3 days before Washington

South Dakota 2 Nov 1889 6 days before Montana

North Dakota 2 Nov 1889  same day as South Dakota

Colorado   1 Aug 1876 13 yrs 3 mo before North Dakota

Nebraska 1 Mar 1867 9 yrs 5 mo before Colorado

Nevada 31 Oct 1864 2 yrs 4 mo before Nebraska

West Virginia 20 Jun 1863 1 yr 4.5 mo before Nevada

Kansas 29 Jan 1861 2 yr 4.5 mo before West Virginia

Oregon 14 Feb 1859 1 yr 11.5 months before Kanasa

Minnesota 11 May 1858 1 yr 9 months before Oregon

California 9 Sep 1850 7 yr 8 mo before Minnesota

Wisconsin 29 May 1848 2 yr 3 mo before California

Iowa 28 Dec 1846 1 yr 5 moth before Wisconsin

Texas 29 Dec 1845 1 yr before Iowa

Florida 3 Mar 1845 10 months before Texas

Michigan 26 Jan 1837 8 yrs 1 mo before Florida

Arkansas 15 Jun 1836 6.5 mo before Michigan

Missouri 10 Aug 1821 15 yrs 2 mo before Arkansas

Maine 15 Mar 1820 1 yr 5 mo before Missouri

Alabama 14 Dec 1819 3 mo before Maine

Illinois 3 Dec 1818 1 yr before Alabama

Mississippi 10 Dec 1817 1 yr before Alabama

Indiana 11 Dec 1816 1 yr before Mississippi

Louisiana 30 Apr 1812 4 yrs 7 mo before Indiana

Ohio 1 Mar 1803 9 yrs 2 mo before Louisiana

Tennessee 1 Jul 1796 6 yrs 8 mo before Ohio

Kentucky 1 Jun 1792 4 yrs 1 mo before Tennessee

Vermont 4 Mar 1791 1 yr 2 mo before Kentucky