Start with the geography your firm actually serves
Oelwein is recorded by the U.S. Census Bureau as a municipality in Fayette County, Iowa. Its 2020–2024 ACS five-year population estimate is 5,834, with a margin of error of 24. That is context for defining a service area; it does not establish legal demand, search activity, competition, call volume or likely case value. Attribution therefore should not be built around an assumed level of local demand. It should answer whether inquiries from Oelwein, elsewhere in Fayette County or another area reached the firm through a source that can be evaluated.
Recommended approach
Before discussing reporting, decide which geographic distinctions matter to your practice. You may want to separate Oelwein from the rest of Fayette County, or review the county as one service area. Keep those choices explicit in your intake and reporting discussions rather than treating every Iowa inquiry as equivalent.
