1. Start with Harrisburg’s actual service area
The U.S. Census Bureau records Harrisburg as a municipality in Saline County, Illinois, with a 2020–2024 ACS 5-year population estimate of 8,372 and a margin of error of 314. That fact establishes the place and county relationship; it does not establish call volume, legal demand, competition, language preference, staffing requirements or likely revenue. Your service area may extend beyond Harrisburg, but that is a firm decision rather than something to infer from the city estimate.
Recommended approach
In a Bosseo consultation, write down the geographic scope your phone team is meant to serve: Harrisburg, Saline County, Illinois more broadly or another clearly defined area. Then decide whether the answering flow should ask for location, practice area and timing as part of intake. Review those fields for usefulness instead of treating local population as a forecast.
