The US has 50 states and has been a union for 172 years. December is the most common month for states to join, while September and October are the least common. North and South Dakota were admitted on the same day, and some states were admitted on holidays. Two charts show the dates each state was admitted, sorted by date and alphabetically.
The United States of America currently consists of 50 states and has officially joined the union for a period of 172 years. Here are some interesting statistics on states admitted to union:
Most common day of the month to join the union: 1st of the month (five states)
Most common month to join: December (nine states)
Least common month to join the union: September and October (one entry each)
Only two states were admitted on exactly the same date: North and South Dakota (November 2, 1889)
Admission dates that coincide with US holidays:
Oregon and Arizona admitted on Valentine’s Day (February 14)
Nevada Admitted on Halloween (October 31)
Washington was admitted to Veteran’s Day (November 11)
Most admissions in any given month: November 1889 (four)
Year with most appearances: 1788 (eight)
Here are two charts showing the dates each state was admitted to the United States. The first table lists them in order of date of admission. In the second table they are organized in alphabetical order.
sorted by date
#
Region / State
Date of admission
1
Delaware
December 7, 1787
2
Pennsylvania
December 12, 1787
3
New Jersey
December 18, 1787
4
Georgia
January 2, 1788
5
Connecticut
January 9, 1788
6
Massachusetts
February 6, 1788
7
Maryland
April 28, 1788
8
South Carolina
23 maggio 1788
9
new Hampshire
June 21, 1788
10
Virginia
June 25, 1788
11
New York
July 26, 1788
12
North Carolina
November 21, 1789
13
RI
29 maggio 1790
14
Vermont
March 4, 1791
15
Kentucky
June 1, 1792
16
Tennessee
June 1, 1796
17
Ohio
March 1, 1803
18
Louisiana
April 30, 1812
19
Indiana
December 11, 1816
20
Mississippi
December 10, 1817
21
Illinois
December 3, 1818
22
Alabama
December 14, 1819
23
Maine
March 15, 1820
24
Missouri
August 10, 1821
25
AR
June 15, 1836
26
Michigan
January 26, 1837
27
Florida
March 3, 1845
28
Texas
December 29, 1845
29
Iowa
December 28, 1846
30
Wisconsin
29 maggio 1848
31
California
September 9, 1850
32
Minnesota
11 maggio 1858
33
Oregon
February 14, 1859
34
Kansas
January 29, 1861
35
West Virginia
June 20, 1863
36
Nevada
October 31, 1864
37
Nebraska
March 1, 1867
38
Colorado
August 1, 1876
39
North Dakota
November 2, 1889
40
South Dakota
November 2, 1889
41
Montana
November 8, 1889
42
Washington
November 11, 1889
43
Idaho
July 3, 1890
44
Wyoming
July 10, 1890
45
Utah
January 4, 1896
46
Oklahoma
November 16, 1907
47
New Mexico
January 6, 1912
48
Arizona
February 14, 1912
49
Alaska
January 3, 1959
50
Hawaii
August 21, 1959
#
Region / State
Date of admission
sorted by state
#
Region / State
Date of admission
22
Alabama
December 14, 1819
49
Alaska
January 3, 1959
48
Arizona
February 14, 1912
25
AR
June 15, 1836
31
California
September 9, 1850
38
Colorado
August 1, 1876
5
Connecticut
January 9, 1788
1
Delaware
December 7, 1787
27
Florida
March 3, 1845
4
Georgia
January 2, 1788
50
Hawaii
August 21, 1959
43
Idaho
July 3, 1890
21
Illinois
December 3, 1818
19
Indiana
December 11, 1816
29
Iowa
December 28, 1846
34
Kansas
January 29, 1861
15
Kentucky
June 1, 1792
18
Louisiana
April 30, 1812
23
Maine
March 15, 1820
7
Maryland
April 28, 1788
6
Massachusetts
February 6, 1788
26
Michigan
January 26, 1837
32
Minnesota
11 maggio 1858
20
Mississippi
December 10, 1817
24
Missouri
August 10, 1821
41
Montana
November 8, 1889
37
Nebraska
March 1, 1867
36
Nevada
October 31, 1864
9
new Hampshire
June 21, 1788
3
New Jersey
December 18, 1787
47
New Mexico
January 6, 1912
11
New York
July 26, 1788
12
North Carolina
November 21, 1789
39
North Dakota
November 2, 1889
17
Ohio
March 1, 1803
46
Oklahoma
November 16, 1907
33
Oregon
February 14, 1859
2
Pennsylvania
December 12, 1787
13
RI
29 maggio 1790
8
South Carolina
23 maggio 1788
40
South Dakota
November 2, 1889
16
Tennessee
June 1, 1796
28
Texas
December 29, 1845
45
Utah
January 4, 1896
14
Vermont
March 4, 1791
10
Virginia
June 25, 1788
42
Washington
November 11, 1889
35
West Virginia
June 20, 1863
30
Wisconsin
29 maggio 1848
44
Wyoming
July 10, 1890
#
Region / State
Date of admission
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