Clay County Census 2000
| City or Township | Population 2000 | Population 1990 | Change in Population | Change as % |
|---|---|---|---|---|
| City of Barnesville | 2,173 | 2,066 | 107 | 5.18 |
| City of Comstock | 123 | 123 | 0 | 0 |
| City of Dilworth | 3,001 | 2,562 | 439 | 17.14 |
| City of Felton | 216 | 211 | 5 | 2.37 |
| City of Georgetown | 125 | 107 | 18 | 16.82 |
| City of Glyndon | 1,049 | 862 | 187 | 21.69 |
| City of Hawley | 1,882 | 1,655 | 227 | 13.72 |
| City of Hitterdal | 201 | 242 | -41 | -16.94 |
| City of Moorhead | 32,177 | 32,295 | -118 | -0.37 |
| City of Sabin | 421 | 495 | -74 | -14.95 |
| City of Ulen | 532 | 547 | -15 | -2.74 |
| Township of Alliance | 246 | 267 | -21 | -7.87 |
| Township of Barnesville | 149 | 180 | -31 | -17.22 |
| Township of Cromwell | 323 | 310 | 13 | 4.19 |
| Township of Eglon | 440 | 419 | 21 | 5.01 |
| Township of Elkton | 283 | 338 | -55 | -16.27 |
| Township of Elmwood | 371 | 392 | -21 | -5.36 |
| Township of Felton | 108 | 106 | 2 | 1.89 |
| Township of Flowing | 97 | 114 | -17 | -14.91 |
| Township of Georgetown | 188 | 179 | 9 | 5.03 |
| Township of Glyndon | 281 | 314 | -33 | -10.51 |
| Township of Goose Prairie | 199 | 206 | -7 | -3.40 |
| Township of Hagen | 153 | 200 | -47 | -23.50 |
| Township of Hawley | 459 | 421 | 38 | 9.03 |
| Township of Highland Grove | 304 | 300 | 4 | 1.33 |
| Township of Holy Cross | 129 | 137 | -8 | -5.84 |
| Humboldt Township | 239 | 260 | -21 | -8.08 |
| Township of Keene | 128 | 165 | -37 | -22.42 |
| Township of Kragnes | 319 | 346 | -27 | -7.80 |
| Township of Kurtz | 288 | 322 | -34 | -10.56 |
| Township of Moland | 340 | 310 | 30 | 9.68 |
| Township of Moorhead | 442 | 501 | -59 | -11.78 |
| Township of Morken | 203 | 190 | 13 | 6.84 |
| Township of Oakport | 1,689 | 1,386 | 303 | 21.86 |
| Township of Parke | 450 | 468 | -18 | -3.85 |
| Township of Riverton | 462 | 401 | 61 | 15.21 |
| Township of Skree | 166 | 157 | 9 | 5.73 |
| Township of Spring Prairie | 364 | 311 | 53 | 17.04 |
| Township of Tansem | 222 | 226 | -4 | -1.77 |
| Township of Ulen | 163 | 192 | -29 | -15.10 |
| Township of Viding | 124 | 139 | -15 | -10.79 |
| Total | 51,229 | 50,422 | 807 | 1.60 |