- Libertarian Party of Mercer County
- Includes meeting and events information for the central committee of the Libertarian Party of Mercer County.
- Mercer County
- Portal with official Mercer County information. Offering commissioners, boards, and visiting Mercer County.
- Mercer County Bar Association
- Group of Mercer County lawyers engaging with the community through committees and sections.
- Mercer County Fire Academy
- Training center for Mercer County fire personnel.
- Mercer County Genealogy Trails
- Provides genealogy and history information including marriages, obituaries, wills and newspaper data.
- Mercer County Library System
- Provides library policies, hours of operation, and book collection database.
- Mercer County Ultimate Disc League
- Information on the league, its standings and schedule.
- NAMI Mercer New Jersey
- Support group for families of the mentally ill. Offers programs and various services.
- National Association of Counties: Mercer County, NJ
- Features information regarding the county population, elected officials, demographic data, and census facts.
- National Register of Historical Places: Mercer County, New Jersey
- National register of the historical places and districts in the county. Gives information about the historical significance, function, architectural style, builder, and owner.
- Weichert: Mercer County Real Estate
- Contains a comprehensive database of homes for sale in Mercer County. Also includes school reports and demographic details.
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