Populations	1920 Actual	1930 Actual	1940 Actual	1950 Actual	1960 Actual	1970 Actual	1980 Actual	1990 Actual	2000 Actual	2010 Actual	2020 Est.	2021 Est.
Towns Belgium Cedarburg Fredonia Grafton Port Washington Saukville	1,516 1,283 1,444 916 1,066 1,062	1,300 1,346 1,149 867 773 986	1,281 1,324 1,163 955 891 1,071	1,467 1,568 1,191 1,225 1,079 1,185	1,646 2,248 1,475 1,996 1,303 1,306	1,625 3,774 1,746 3,127 1,528 1,516	1,424 5,244 2,144 3,588 1,436 1,583	1,405 5,143 2,043 3,745 1,480 1,671	1,513 5,559 2,060 3,980 1,631 1,755	1,415 5,760 2,172 4,053 1,643 1,822	1,434 6,006 2,186 4,227 1,644 1,843	1,449 6,069 2,206 4,268 1,664 1,859
Villages Bayside (part) Belgium Fredonia Grafton Newburg (part) Saukville Thiensville	- 215 272 898 - 330 334	- 268 312 1,065 - 399 500	- 356 356 1,150 - 431 645	- 460 471 1,489 - 699 897	103 643 710 3,746 - 1,038 2,507	123 809 1,045 5,998 - 1,389 3,182	112 892 1,437 8,381 95 3,494 3,341	108 928 1,558 9,340 105 3,695 3,301	103 1,678 1,934 10,312 92 4,068 3,254	89 2,245 2,160 11,459 97 4,451 3,235	89 2,448 2,199 11,989 95 4,396 3,164	90 2,501 2,211 12,155 95 4,424  3,183
Cities Cedarburg Mequon Port Washington	1,738 *2,408 3,340	2,055 *2,771 3,692	2,245 *3,068 4,047	2,810 *4,064 4,755	5,191 8,543 5,974	7,697 12,150 8,752	9,005 16,193 8,612	10,086 18,885 9,338	11,102 22,666 10,467	11,412 23,132 11,250	12,147 24,806 11,954	12,503 25,051 12,307
Total	16,822	17,483	18,983	23,361	38,441	54,461	66,981	72,831	82,317	86,395	90,630	92,035

*Mequon was a town before 1957
** For source of information for estimates see