1. Start with O'Fallon’s actual service footprint
O'Fallon is a municipality in St. Charles County, Missouri. The 2020–2024 American Community Survey five-year population estimate for the city is 93,801, with a margin of error of 84. That figure describes the city’s population; it does not establish legal demand, search volume, competition, lead volume or revenue. It also does not describe every person your firm may serve. Your attribution design should therefore distinguish O'Fallon from St. Charles County and any other geographic area in your intake and reporting rather than treating one population figure as a marketing forecast.
Recommended approach
Use geography as a reporting question. Decide which locations, service pages and referral paths your firm wants to compare, then review whether each inquiry can be associated with the relevant page or source without implying that local population equals prospective-client demand.
