Based on their voting record for President, the following states have been together for 10 elections or moreSince 1844 (38 times) In 1840, Mississippi went for Harrison, Alabama for Van Buren. Neither voted in 1864, and Mississippi didn't vote in 1868. Alabama for Byrd in 1960 based on electoral vote majority.
1900 (26) In 1896, North Dakota (McKinley) and Kansas (Bryan).
1912 (23) In 1908, KS and ND (Taft) and Nebraska (Bryan)
1916 (22) In 1912, Idaho (Wilson) and Utah (Taft)
1916 (22) In 1912, Indiana (Wilson) and South Dakota (Roosevelt)
1920 (21) In 1916, KS, NE, and ND (Wilson) and IN and SD (Hughes)
1920 (21) In 1916, New Mexico (Wilson) and Illinois (Hughes)
1924 (20) In 1920, Oklahoma (Harding) and Virginia (Cox)
1928 (19) In 1924, ID and UT (Coolidge) and OK and VA (Davis)
1944 (15) In 1940, Connecticut (Roosevelt) and Michigan (Wilkie)
1948 (14) In 1944, ID, OK, VA, and UT (Roosevelt) and Wyoming (Dewey)
1948 (14) In 1944, Montana (Roosevelt) and Colorado (Dewey)
1948 (14) In 1944, Tennessee (Roosevelt) and Ohio (Dewey)
1952 (13) In 1948, ID, OK, VA, UT, WY (Truman) and IN, KS, NE, ND, SD (Dewey)
1952 (13) In 1948, IL and NM (Truman) and New Jersey (Dewey)
1952 (13) In 1948, California (Truman) and Vermont (Dewey)
1952 (13) In 1948, Iowa (Truman) and Oregon (Dewey)
1956 (12) In 1952, TN and OH (Eisenhower) and Kentucky (Stevenson)
1960 (11) Alaska (first election) and ID, IN, KS, NE, ND, OK, SD, VA, UT, WY
1960 (11) Hawaii (first election) and Rhode Island
1964 (10) In 1960, NM, NJ, and IL (Kennedy) and CA and VT (Nixon)
1964 (10) In 1960, Missouri (Kennedy) & KY, OH, and TN (Nixon)
1964 (10) In 1960, CT and MI (Kennedy) and Maine (Nixon)
1964 (10) In 1960, Nevada (Kennedy) and New Hampshire (Nixon)
The Longest Streak for States with Fewer than 10 Elections Together (state name spelled out if longest streak)1968 (9) In 1964, North Carolina (Johnson) and South Carolina (Goldwater)
1968 (9) In 1964, Arkansas (Johnson) and Louisiana (Goldwater)
1972 (
In 1968, NC, SC (Nixon) and Texas (Humphrey) and AL, MS (Wallace)
1972 (
In 1968, Delaware (Nixon) and Pennsylvania (Humphrey)
1972 (
In 1968, Wisconsin (Nixon) and New York (Humphrey)
1972 (
In 1968, IA, OR (Nixon) and Washington (Humphrey)
1976 (7) In 1972, Minnesota (Nixon) and District of Columbia (McGovern)
1976 (7) In 1972, NY, WI (Nixon) and Massachusetts (McGovern)
1980 (6) In 1976, Florida (Carter) and Arizona (Ford)
1984 (5) In 1980. CO, MT (Reagan) and Georgia (Carter)
1984 (5) In 1980. CA, CT, DE, IL, ME, MI, NJ, NM, PA, VT (Reagan) and Maryland (Carter)
1992 (3) In 1988 AR, LA (Bush) and West Virginia (Dukakis)
Split Apart In 2000Been Together Since 1912 (22) Nevada and New Mexico (since New Mexico statehood)
1920 (20) Nevada and Illinois
1948 (13) New Hampshire and Vermont
1952 (12) Nevada and New Jersey
1952 (12) New Hampshire and California
1956 (11) West Virginia and Rhode Island
1960 (10) West Virginia and Hawaii (since Hawaii statehood)
1960 (10) Missouri and Delaware (had both picked
winner since 1960)