Start with the Sherman geography you actually serve
Sherman is recorded as a municipality in Grayson County. That distinction matters when reviewing attribution: a lead from Sherman is not automatically the same as a lead from every part of Grayson County, and neither should be treated as evidence of demand in another Texas market. Your firm can review journeys by the geographic information available in its own intake records and decide whether service area, office coverage or matter eligibility belongs in qualification.
Recommended approach
Bring your actual service-area rules to the review.
