you are prolly thinking of cook county. that is chicago an everything is outlawed up there. an example-
There is no state preemption of firearm laws. Some municipalities, most notably Chicago, require that all firearms be registered with the local police department.[75] Until June 2010 Chicago did not allow the registration of handguns, which had the effect of outlawing their possession, unless they were grandfathered in by being registered before April 16, 1982. (see below)[76][77] The Chicago suburb of Oak Park had also banned handguns (see below)[78] and the town of Highland Park bars handgun possession unless the resident has obtained a permit from the police.[79] The status of these various handgun ordinances has been uncertain since June 26, 2008, when the U.S. Supreme Court struck down Washington, D.C.'s handgun ban in the case of District of Columbia v. Heller.[80][81] In the months following the Heller decision, handgun bans were repealed in the suburbs of Wilmette,[82] Morton Grove,[83] Evanston,[84] and Winnetka,[85] but Chicago and Oak Park have fought in court to keep their current laws.[86][87][88][89] On June 28, 2010 after reviewing Chicago's handgun ban in the case of McDonald v. Chicago,[90] the Supreme Court has deemed that both the handgun bans of Chicago and Oak Park to be unconstitutional.