Distribution of Grenfell Individuals (including variants) from the 1860 - 1940 United States Federal census.
| Census | 1860 | 1870 | 1880 | 1900 | 1910 | 1920 | 1930 | 1940 |
|---|---|---|---|---|---|---|---|---|
| California | 9 | 9 | 18 | 18 | 50 | 66 | 73 | 90 |
| Colorado | 9 | 41 | 38 | 39 | 44 | 39 | ||
| Connecticut | 8 | 1 | 3 | 3 | 10 | 9 | ||
| District of Columbia | 6 | 5 | 5 | 4 | ||||
| Idaho | 5 | 23 | 4 | 12 | 9 | |||
| Illinois | 1 | 2 | 9 | 24 | 7 | 2 | 2 | |
| Iowa | 2 | 12 | 10 | |||||
| Maryland | 7 | 9 | 16 | 21 | 5 | |||
| Massachusetts | 1 | 7 | 18 | 21 | 7 | 3 | ||
| Michigan | 2 | 8 | 29 | 48 | 39 | 67 | 61 | |
| Montana | 5 | 6 | 9 | 5 | ||||
| New Mexico | 8 | 7 | 5 | 4 | 7 | |||
| New York | 2 | 8 | 19 | 23 | 19 | |||
| Ohio | 17 | 20 | 12 | 8 | 6 | 11 | 14 | 15 |
| Oregon | 11 | 7 | 10 | 34 | 53 | 60 | ||
| Pennsylvania | 1 | 4 | 31 | 34 | 53 | 40 | 53 | |
| South Dakota | 11 | 10 | 6 | 1 | 7 | |||
| Washington | 7 | 27 | 17 | 13 | ||||
| Wisconsin | 9 | 16 | 10 | 10 | 6 | 6 | 7 | 3 |
| Others | 3 | 1 | 34 | 29 | 23 | 24 | 48 | 49 |
| Total | 43 | 56 | 126 | 243 | 346 | 385 | 436 | 453 |
