Start with the Herculaneum service area, not a population forecast
Herculaneum is recorded as a city in Jefferson County. For a firm serving this municipality, the first useful decision is geographic scope: which inquiries are intended for the firm, which matter types are accepted, and whether the same workflow applies to nearby service areas. Population is eligibility context only. It cannot tell you how many people will contact a law firm, how quickly they will respond, what language they prefer or how many matters the firm can accept.
Recommended approach
Use the consultation to define the service-area rules and intake questions that are actually relevant to your practice. Keep Herculaneum, Jefferson County and any broader Missouri coverage distinct in your internal routing and reporting decisions. Do not create response logic from an assumed level of demand.
