Estimates of the Number of Bison and Elk in Yellowstone National Park, 1877-1918
 
Estimates of the Number of Buffalo and Elk in Yellowstone National Park, 1877-1918: Source is Aubrey Haines, The Yellowstone Story, (volume 2), Yellostone: Yellowstone Library and Museum Association, 1977, 483-484.  Taken from reports of superintendents and acting superintendents.  1877, 1881, 1890 originate from the annual report of the Secretary of the Interior.
Year 
Number of Buffalo 
Number of Elk
1877 
"three... or four hundred" 
"thousands" 
1879 
 
"have increased" 
1880 
3 bands, totaling 600 
"not seriously diminished" 
1885 
"neighborhood of two hundred" 
"many thousands" 
1886 
"abundance of game" 
"abundance of game" 
1887 
"will not exceed one hundred" 
"estimated...several thousands" 
1888 
"not less than two hundred" 
"many thousands" 
1889 
"in undiminished numbers" 
"in undiminished numbers" 
1890 
"a great increase in all" 
"a great increase in all" 
1891 
"probably there are 400" 
"numbers at 25,000" 
1892 
"not less than four hundred" 
"estimate of 25,000" 
1893 
"four hundred...not too high" 
"there are 25,000" 
1894 
"estimate...200" 
"wintered well" 
1895 
"two hundred still remain" 
"held there own or increased" 
1896 
"existence...possibly of 50" 
"in herds of thousands" 
1897 
"estimated at 24" 
"increasing" 
1898 
"probably 50" 
"numerous...increasing" 
1899 
"fifty or more" 
"from 35,000 to 60,000" 
1900 
probably 39 
"are increasing" 
1901 
"not...more than 25" 
"about 25,000" 
1902 
22 seen 
"considerable increase" 
1903 
captive herd of 27 
"loss...was very small" 
1904 
captive herd of 39 
a favorable year 
1905 
44 captive, 30 wild 
"quite enough" 
1906 
captive herd of 57 
"loss was very small" 
1907 
59 captive, 25 wild 
"25,000...a safe estimate" 
1908 
captive herd of 74 
"between 25,000 and 30,000" 
1909 
95 captive, 20 wild 
"between 30,000 and 40,000" 
1910 
121 captive, 34 wild 
"from 30,000 to 40,000" 
1911 
147 captive, 35 wild 
"are very numerous" 
1912 
143 captive, 49 wild 
census 27,801 
1913 
captive herd of 162 
census 32,967 
1914 
captive herd of 193 
census 35,308 
1915 
captive herd of 239 
"estimated total of 37,192" 
1916 
276 captive, 76 wild 
census 29,544 
1917 
330 captive, 67 wild 
hard winter for elk 
1918 
captive herd of 385 
estimated at 20,000 
 

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