Birth Order

The birth order and sibling counts include half-siblings.
More presidents were second-born than any other birth order - 14.
56% of presidents were either first-born or second-born.
Seven presidents were the youngest in their birth order.
James Madison had more siblings than any other president - 11.
Although there were no only-children, three presidents only had one sibling - Calvin Coolidge, Franklin D. Roosevelt, and Ronald Reagan.
On average the presidents had a little over 5 siblings.
* indicates that the president was the youngest child.

#	President	# Siblings	# Presidents
	First Born		11
2	John Adams	2
4	James Madison	11
11	James K. Polk	9
18	Ulysses S. Grant	5
29	Warren G. Harding	7
30	Calvin Coolidge	1
36	Lyndon B. Johnson	4
38	Gerald R. Ford	6
39	Jimmy Carter	3
43	George W. Bush	5
46	Joe Biden	3
	Second Born		14
5	James Monroe	4
6	John Quincy Adams	4
13	Millard Fillmore	7
15	James Buchanan	10
16	Abraham Lincoln	2
23	Benjamin Harrison	7
26	Theodore Roosevelt	3
31	Herbert Hoover	2
32	Franklin D. Roosevelt	1 *
33	Harry S. Truman	3
35	John F. Kennedy	8
37	Richard M. Nixon	4
40	Ronald Reagan	1 *
41	George H. W. Bush	4
	Third Born		7
3	Thomas Jefferson	9
7	Andrew Jackson	2 *
17	Andrew Johnson	2 *
28	Woodrow Wilson	3
34	Dwight D. Eisenhower	6
42	Bill Clinton	3
44	Barack Obama	8
	Fourth Born		3
12	Zachary Taylor	8
19	Rutherford B. Hayes	3 *
45 & 47	Donald J. Trump	4
	Fifth Born		3
20	James A. Garfield	4 *
21	Chester A. Arthur	8
22 & 24	Grover Cleveland	8
	Sixth Born		4
1	George Washington	10
8	Martin Van Buren	7
10	John Tyler	7
14	Franklin Pierce	8
	Seventh Born		3
9	William Henry Harrison	6 *
25	William McKinley	8
27	William H. Taft	9

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