1. Define the geographic area before setting coverage
The Census record identifies Centralia city, Illinois, as a municipality and records relationships with Clinton County, Jefferson County, Marion County, and Washington County. That does not mean every searcher in those counties is a suitable prospect, and it does not establish that a campaign should cover all four. Geographic settings should follow the clients and matters your firm is prepared to serve, not a population estimate. Bosseo’s public Local Service Ads page says its program includes practice-area categories and service areas set deliberately. That makes geographic scope a decision to review rather than a fact to assume.
Recommended approach
Bring your actual service boundary to the consultation. Decide whether the profile should focus on Centralia, extend into selected areas associated with the city, or use a narrower service zone for particular case types. Keep the decision separate from population: the Census figure can describe the municipality, but it cannot tell you which locations will produce qualified inquiries.
