Tennessee
Buying Land in Washington County, Tennessee
County seat Jonesborough, largest city Johnson City, part of the Tri-Cities region alongside Kingsport and Bristol. Washington County claims two firsts: it's Tennessee's oldest county, established in 1777, and Jonesborough is the state's oldest town. It also zones countywide through a Regional Planning Commission -- here's what that structure means for land here.
Tennessee's oldest county, and the oldest town at its center
Washington County holds a genuinely distinctive place in Tennessee history: it was established in 1777, while the region was still part of North Carolina, years before Tennessee achieved statehood in 1796 -- making it the oldest of what would become Tennessee's 95 counties. Jonesborough, the county seat, follows closely behind, established in 1779 and consistently recognized as Tennessee's oldest town. That depth of history is not just a trivia point; Jonesborough's downtown carries a well-preserved historic character that has been actively maintained through decades of deliberate community planning and zoning, and the town remains a genuine destination -- notably as home to the National Storytelling Festival -- built in part on that preserved character.
For a land buyer, this history is most concretely relevant if you're considering property inside Jonesborough's National Register Historic District itself: the town maintains its own separate Historic Zoning Commission, which re-evaluates every property within that district on a five-year cycle and reviews exterior changes against historic-preservation standards. That's a real, additional layer of review beyond standard municipal zoning, and it's worth understanding fully -- including what it does and doesn't restrict about renovation, additions, or new construction -- before buying a historic-district property specifically for its character rather than in spite of the extra oversight.
Countywide zoning through the Regional Planning Commission
Outside Jonesborough's historic core, Washington County is among the roughly half of Tennessee counties that have adopted countywide zoning for unincorporated territory. That framework is administered by the Washington County Regional Planning Commission, a seven-member appointed board that also maintains the county's Subdivision Regulations governing how larger tracts get split into multiple lots, and that reviews and recommends text amendments to the zoning ordinance itself. As with any Tennessee county zoning arrangement, land inside Johnson City, Jonesborough, or the county's other incorporated municipalities falls under that municipality's own separate zoning code rather than the county's -- so the first practical question for any parcel remains which jurisdiction actually governs it.
Washington County sits at the heart of Tennessee's Tri-Cities region, alongside Kingsport (mostly in Sullivan County) and Bristol (split between Sullivan County, Tennessee and the independent city of Bristol, Virginia). Johnson City, the region's largest city and largely within Washington County, anchors substantial commercial and residential growth, giving the county a real mix of historic small-town character around Jonesborough, urban and suburban growth around Johnson City, and quieter rural land through much of the rest of the county's territory in the foothills of the Appalachians.
A live 2025-2026 fight over data-center zoning
Separately from the county's historic character and its Regional Planning Commission's ordinary zoning work, Washington County has spent 2026 actively restricting a new land use: data centers and cryptocurrency-mining operations. The County Commission passed a resolution banning their construction, operation, and permitting through June 30, 2027, and later approved a further, separate one-year moratorium specifically on new data-center applications in unincorporated county territory. Johnson City, the county's largest city, took a different regulatory path in 2025 -- amending its own zoning ordinance to confine data centers to the I-2 Heavy Industrial District rather than banning the use outright. Public opposition behind this has been unusually well documented, including a city survey in which the overwhelming majority of respondents described themselves as "extremely concerned" about a data center locating nearby.
For a buyer, the practical point is that this area of local regulation is genuinely still in motion -- both the county's moratorium and Johnson City's district restriction are recent enough that further changes are plausible before either becomes a settled, long-term rule. See our dedicated Washington County zoning page for the full timeline, sourcing, and what it means depending on whether you're evaluating land for this kind of large-scale infrastructure use or trying to understand what's currently keeping it away from a nearby parcel.
Septic, water, and the rest of the state framework
The septic standard governing a Washington County parcel not on municipal sewer is TDEC's statewide Rule 0400-48-01, the same one detailed on our Tennessee state page. This pass wasn't able to confirm a specific department name or phone number confidently enough to publish -- start with the county government's main line and ask to be routed to whoever currently handles site evaluations and construction permits, since as one of Tennessee's oldest counties the office structure has shifted over the decades and isn't something worth guessing at.
Water rights, manufactured-home regulation, right-to-farm protection, and agritourism liability all follow Tennessee's statewide framework -- nothing found in Washington County's own ordinances alters any of those. Given the region's mountainous and hilly terrain in its more rural stretches, a site/soil evaluation before you buy is worth prioritizing on any parcel outside the Johnson City/Jonesborough urban core, similar to the guidance on this project's Unicoi County page just to the east.
Who to Call Before Buying Land in Washington County
Direct WebFetch to washingtoncountytn.org was blocked by network egress restrictions in this research session, so several details reflect search-indexed content rather than a full verbatim site read -- confirm current staff, hours, fees, and Jonesborough historic-district requirements directly before relying on this page.
Planning & Zoning
Washington County Regional Planning Commission
Zoning district lookups, subdivision regulations, and text amendments to the county zoning ordinance.
Planning & Zoning
Town of Jonesborough Historic Zoning Commission
Design-review requirements for property inside the National Register Historic District.
Septic / Onsite Wastewater
Washington County government (main line)
Being routed to the correct office for septic (subsurface sewage disposal) permitting -- this pass could not confirm a specific office name with confidence.
Recorder / Clerk / Land Records
Washington County Register of Deeds
Recorded deeds, easements, and plats.
Want to know if this specific parcel actually works?
Tell us what you're looking at and we'll connect you with a local land specialist who can help you sanity-check it before you go further.
Get local guidanceTopics Specific to Washington County
Sources
- Zoning, Planning & Building Codes | Washington County, TN — Washington County, Tennessee (accessed 2026-09)
- Regional Planning Commission | Washington County, TN — Washington County, Tennessee (accessed 2026-09)
- Regional Planning Commission - Town of Jonesborough, Tennessee — Town of Jonesborough, Tennessee (accessed 2026-09)
- Jonesborough, Tennessee — Advisory Council on Historic Preservation (accessed 2026-09)
- Washington County, Tennessee — Wikipedia (accessed 2026-09)
- Washington County Commission approves data center moratorium — WJHL (accessed 2026-09)
- County approves one-year moratorium on data-center applications — Washington County News (accessed 2026-09)
- Ordinance 4914-25, Third/Final Reading -- Agenda Summary — City of Johnson City, Tennessee (accessed 2026-09)
Last reviewed 2026-09