1. Start with the service area, not the population number
The U.S. Census Bureau records Mastic Beach as a CDP in Suffolk County, New York, with a 2020–2024 ACS 5-year population estimate of 16,735. That establishes the place and its county relationship. It does not establish how many people search for a lawyer, which services they need, how many firms compete for those searches, or whether a page would produce a case. For your firm, the practical question is whether you accept matters from Mastic Beach and whether Suffolk County is inside the area you intend to serve. Bosseo’s public Programmatic SEO page describes two broad footprint choices: statewide coverage or a narrower selection of counties. Review the county choice against your intake rules before treating Mastic Beach as a target location.
Recommended approach
Document the locations you actually serve, the matters you accept there, and any consultation or court-service limits. If Suffolk County is outside your intended footprint, do not create a Mastic Beach page merely because the place appears in demographic data. If it is inside your footprint, assess Mastic Beach as one location within a broader county or state decision.
