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| City | ZIP Code | County |
|---|
| Walnut | 61376 | Bureau |
| Walnut Hill | 62893 | Marion |
| Walsh | 62297 | Randolph |
| Walshville | 62091 | Montgomery |
| Waltonville | 62894 | Jefferson |
| Wapella | 61777 | De Witt |
| Warren | 61087 | Jo Daviess |
| Warrensburg | 62573 | Macon |
| Warrenville | 60555 | Dupage |
| Warsaw | 62379 | Hancock |
| Wasco | 60183 | Kane |
| Washburn | 61570 | Woodford |
| Washington | 61571 | Tazewell |
| Wataga | 61488 | Knox |
| Waterloo | 62298 | Monroe |
| Waterman | 60556 | Dekalb |
| Watseka | 60970 | Iroquois |
| Watson | 62473 | Effingham |
| Wauconda | 60084 | Lake |
| Waukegan | 60079 | Lake |
| Waukegan | 60085 | Lake |
| Waukegan | 60087 | Lake |
| Waverly | 62692 | Morgan |
| Wayne | 60184 | Dupage |
| Wayne City | 62895 | Wayne |
| Waynesville | 61778 | De Witt |
| Wedron | 60557 | La Salle |
| Weldon | 61882 | De Witt |
| Wellington | 60973 | Iroquois |
| Wenona | 61377 | Marshall |
| West Brooklyn | 61378 | Lee |
| West Chicago | 60185 | Dupage |
| West Chicago | 60186 | Dupage |
| West Frankfort | 62896 | Franklin |
| West Liberty | 62475 | Jasper |
| West Point | 62380 | Hancock |
| West Salem | 62476 | Edwards |
| West Union | 62477 | Clark |
| West York | 62478 | Clark |
| Westchester | 60154 | Cook |
| Western Springs | 60558 | Cook |
| Westfield | 62474 | Clark |
| Westmont | 60559 | Dupage |
| Westville | 61883 | Vermilion |
| Wheaton | 60187 | Dupage |
| Wheaton | 60189 | Dupage |
| Wheeler | 62479 | Jasper |
| Wheeling | 60090 | Cook |
| White Hall | 62092 | Greene |
| White Heath | 61884 | Piatt |
| Whittington | 62897 | Franklin |
| Williamsfield | 61489 | Knox |
| Williamsville | 62693 | Sangamon |
| Willisville | 62997 | Perry |
| Willow Hill | 62480 | Jasper |
| Willow Springs | 60480 | Cook |
| Willowbrook | 60527 | Dupage |
| Wilmette | 60091 | Cook |
| Wilmington | 60481 | Will |
| Wilsonville | 62093 | Macoupin |
| Winchester | 62694 | Scott |
| Windsor | 61957 | Shelby |
| Winfield | 60190 | Dupage |
| Winnebago | 61088 | Winnebago |
| Winnetka | 60093 | Cook |
| Winslow | 61089 | Stephenson |
| Winthrop Harbor | 60096 | Lake |
| Witt | 62094 | Montgomery |
| Wolf Lake | 62998 | Union |
| Wonder Lake | 60097 | McHenry |
| Wood Dale | 60191 | Dupage |
| Wood Dale | 60399 | Dupage |
| Wood River | 62095 | Madison |
| Woodhull | 61490 | Henry |
| Woodland | 60974 | Iroquois |
| Woodlawn | 62898 | Jefferson |
| Woodridge | 60517 | Dupage |
| Woodson | 62695 | Morgan |
| Woodstock | 60098 | McHenry |
| Woosung | 61091 | Ogle |
| Worden | 62097 | Madison |
| Worth | 60482 | Cook |
| Wrights | 62098 | Greene |
| Wyanet | 61379 | Bureau |
| Wyoming | 61491 | Stark |
| Xenia | 62899 | Clay |
| Yale | 62481 | Jasper |
| Yates City | 61572 | Knox |
| Yorkville | 60560 | Kendall |
| Zeigler | 62999 | Franklin |
| Zion | 60099 | Lake |
