Blairstown, New Jersey
township in Warren County, New Jersey, United States of America
Blairstown is a township in Warren County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 5,704, a decrease of 263 (−4.4%) from the 2010 census count of 5,967, which in turn reflected an increase of 220 (+3.8%) from the 5,747 counted in the 2000 census.
The area had been known as Smith's Mill and was later called Butts Bridge (variously spelled as "Butt's Bridge" and "Butts' Bridge"), named for a family that owned the eponymous crossing of the Paulins Kill.
Blairstown was incorporated as a township by an act of the New Jersey Legislature on April 14, 1845, from portions of Knowlton Township, based on the results of a referendum held that day. The township was named for John Insley Blair.
Geography
According to the U.S. Census Bureau, the township had a total area of 30.78 square miles (79.71 km2), including 29.89 square miles (77.41 km2) of land and 0.89 square miles (2.30 km2) of water (2.88%). The township is located in the Kittatinny Valley which is a section of the Great Appalachian Valley that stretches for 700 miles (1,100 km) from Canada to Alabama.
Blairstown CDP (with a 2020 Census population of 493) is an unincorporated community and census-designated place (CDP) located within the township. A portion of Hainesburg (with a 2020 Census population of 422), which is primarily located in Knowlton Township, falls within Blairstown's borders.
Other unincorporated communities, localities and place names located partially or completely within the township include Blair Lake, Cedar Lake, Cooks Pond, Jacksonburg, Kalarama, Lake Susquehanna, Mount Vernon, Paulina, Vail and Walnut Valley.
Begin with the source’s own compact description: “Blairstown, New Jersey” is township in Warren County, New Jersey, United States of America. The dossier treats that line as a proposition to test through Blairstown, Jersey and township, not as a finished interpretation.
Why this record matters
The phrase “township in Warren County, New Jersey, United States of America” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
The strongest evidence will usually combine a dated visual record with documents produced by the authority responsible for the place. The source revision retrieved here is dated Aug 17, 2026. The linked authority identifier is Q950876. Authority coordinates are 40.980, -74.997. 2 of 3 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank. The first chronological checks are 2020, 2010, 2000 and 1845.
A single description cannot reconcile every naming convention, rebuilding phase or administrative transfer associated with a place. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “Blairstown, New Jersey”, its source revision and the description used here.
- Expand the search: follow Blairstown, New Jersey primary sources, Blairstown, New Jersey archive and Blairstown research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Blairstown, New Jersey”?
- Which earlier names or jurisdictions may reveal additional records?
- Which authority defined the place, boundary or structure at the relevant date?
Search terms from this dossier
This entry incorporates text from “Blairstown, New Jersey” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.