Whatcom County Population 2018
Whatcom County's estimated population is 221,404 with a growth rate of 2.37% in the past year according to the most recent United States census data. Whatcom County is the 9th largest county in Washington.
| Year | Population | Growth | Growth Rate |
| 2017 | 221,404 | 5,130 | 2.37% |
| 2016 | 216,274 | 4,561 | 2.15% |
| 2015 | 211,713 | 3,601 | 1.73% |
| 2014 | 208,112 | 1,923 | 0.93% |
| 2013 | 206,189 | 1,311 | 0.64% |
| 2012 | 204,878 | 1,431 | 0.70% |
| 2011 | 203,447 | 1,927 | 0.96% |
| 2010 | 201,520 | 73,740 | 57.71% |
| 1990 | 127,780 | 21,079 | 19.76% |
| 1980 | 106,701 | 24,751 | 30.20% |
| 1970 | 81,950 | 11,633 | 16.54% |
| 1960 | 70,317 | 3,584 | 5.37% |
| 1950 | 66,733 | 6,378 | 10.57% |
| 1940 | 60,355 | 1,227 | 2.08% |
| 1930 | 59,128 | 8,528 | 16.85% |
| 1920 | 50,600 | 1,089 | 2.20% |
| 1910 | 49,511 | 25,395 | 105.30% |
| 1900 | 24,116 | 5,525 | 29.72% |
| 1890 | 18,591 | 15,454 | 492.64% |
| 1880 | 3,137 | 2,603 | 487.45% |
| 1870 | 534 | 182 | 51.70% |
| 1860 | 352 | 0.00% |