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As of the National Park Service's autumn 2026 postings, Allen County holds 83 properties and districts on the National Register of Historic Places, four more having been listed and later removed. Two are National Historic Landmarks, the federal government's highest tier: the Allen County Courthouse, designated on July 31, 2003, and the Chief Jean Baptiste de Richardville House, designated on March 2, 2012 — the Richardville House's story is told in the People and Wealth chapters and is cross-referenced here only.
Every listing stands on a nomination prepared for the Indiana Department of Natural Resources' Division of Historic Preservation and Archaeology, and the division's SHAARD database — the Indiana State Historic Architectural and Archaeological Research Database — keeps the nominations, the survey records and the county's interim reports open to anyone. The Allen County historic sites and structures survey summary alone runs 124 pages. The City of Fort Wayne's own count, in 2021, was 17 National Register districts and 40 single-property National Register listings within the city, alongside the local historic districts the city designates itself.
ARCH Inc. — Architecture and Community Heritage — founded in 1975, is the working preservation organization: it erects markers with the Journal-Gazette Foundation, publishes the Heritage Trail and its Built Heritage ABCs, and holds the street files in which the city's buildings are documented address by address. The register is still growing: the Beechwood district was listed in 2021, the General Electric Electric Works district in 2023, Shawnee Place in 2024, and Kirkwood Park and the Pennsylvania Produce Terminal in 2025.
Sources: National Register of Historic Places listings in Allen County, Indiana (National Park Service list complete through September 18, 2026); Indiana DNR Division of Historic Preservation and Archaeology, SHAARD and recent-listings newsletters, 2024–2026; Allen County Genealogical Society of Indiana (ACGSI), Historic Places page, drawing on the City of Fort Wayne's "10 Things to Know About Historic Preservation in Fort Wayne"; ARCH Inc., archfw.org.