1. Start with Centralia’s actual geographic boundary
Centralia is recorded as a municipality in Illinois. The Census record places Centralia city in relation to Clinton, Jefferson, Marion and Washington counties and reports a 2020–2024 ACS five-year population estimate of 11,856, with a margin of error of 176. That is geographic and population context only. It does not establish legal demand, search activity, competition, call volume or likely case value. For attribution, the practical question is which geographic labels your firm actually uses in its intake records and marketing decisions: Centralia city, one of the listed counties, Illinois more broadly, or another service area you define.
Recommended approach
Before reviewing channel performance, agree on the geographic fields your team will use. Keep Centralia city separate from county and statewide matters. Ask whether a location should be recorded from the prospect’s stated address, the incident location, the court location or another firm-defined field. Those distinctions can change how you interpret a landing page or referral without turning the Census population figure into a forecast.
