Some Local Historical Points of Interest

The Hopewell Museum
Howell Living History Farm
Washington Crossing State Park
Benjamin Temple House
Old School Baptist Church history

Local Libraries

Mercer County Library- Hopewell Township Branch
Hopewell Borough Library
Pennington Borough Library

Historical Research Facilities/Organizations

New Jersey State Library - many printed genealogies, journals, etc.
New Jersey State Archives - statewide vital records, wills, deeds, etc.
Rutgers University Library - includes holdings of Genealogical Society of New Jersey and much more
New Jersey Historical Society (publication: New Jersey History magazine)
Hunterdon County Historical Society (publication: Hunterdon Historical Newsletter)

Genealogy Resources

be sure to also review the more general historical resources listed

Genealogical Society of New Jersey - membership includes subscription to Genealogical Magazine of New Jersey and ability to read and post queries in GSNJ newsletter
Central Jersey Genealogical Club - holds monthly meetings of interest to beginning and experienced genealogists, membership includes newsletter
Mercer County History Website - source of biographical and genealogical data extracted from various sources

GenWeb Project

Volunteer project aiming to cover every county in the U.S. and Worldwide.

LDS Church Website - access to millions of names and genealogical clues worldwide
Ellis Island Records

Neighboring Historical Societies

Ewing Township Historic Preservation Society
The Lawrence Historical Society
Hunterdon County Historical Society
The Historical Society of Princeton
Bucks County Historical Society

Things to Add

Delaware and Raritan Canal Commission
New Jersey Historical Commission