The 14th District of the Cook County Board of Commissioners was established in 1994 as a result of the County Board deciding and transitioning to a system of conducting elections in individual county districts. In 1994, the 14th district encompassed parts of the northwest and north municipalities of Cook County.
The 14th District of the Cook County Board of Commissioners has undergone various redistricting processes since its founding in 1994. The original 1994 boundaries saw the district take up most of the northwest and northern municipalities of Cook County. Then, after the 2000 redistricting, the 14th district encompassed parts of Barrington, Northfield, Niles, Wheeling, and Palatine townships. After the 2010 redistricting, the 14th district encompassed parts of Arlington Heights, Buffalo Grove, Barrington, Deerfield, Glencoe, Deer Park, Golf, Hoffman Estates, Mount Prospect, Inverness, Northfield, Palatine, Northbrook, Prospect Heights, Schaumburg, Rolling Meadows, and Wheeling.
After the most recent 2020 redistricting, the 14th district of the Cook County Board of Commissioners saw the inclusion of a sizable Lake Michigan shoreline with the addition of Winnetka, Kenilworth, Glencoe, and Wilmette.