Does Delaware have county zoning?

Yes. Delaware has only three counties — New Castle, Kent, and Sussex — and each zones all unincorporated land within its borders under Title 9 of the Delaware Code. Incorporated municipalities zone separately under Title 22, so a parcel's governing code depends on whether it sits inside or outside an incorporated town.

Is Delaware a home-rule or Dillon's-rule state?

Delaware is a Dillon's Rule state: municipalities and counties may exercise only the land-use powers the General Assembly has expressly delegated to them, primarily under Title 22 of the Delaware Code for municipalities and Title 9 for the state's three counties, rather than drawing on a broad home-rule grant.

How do I look up zoning for a parcel in Delaware?

Delaware FirstMap, the state's official GIS portal, publishes a statewide parcel layer updated monthly from county assessor data, along with planning-cadastre datasets. For zoning district specifics, cross-reference with the applicable county or municipal zoning map.

Does Delaware have a statewide ADU or missing-middle housing mandate?

No. Unlike some neighboring states, Delaware has not enacted a statewide law requiring municipalities or counties to allow accessory dwelling units or missing-middle housing types by right. ADU and multifamily allowances vary entirely by the zoning code of the local county or municipality.

Delaware · state zoning reference · Waitlist open

Delaware zoning: how it works and what you can build

A Dillon's-rule state with just three counties and historically light-touch land-use regulation, where zoning power stays with the county or municipality and no statewide mandate currently overrides local codes.

How zoning works in Delaware

Delaware is a Dillon's-rule state: municipalities exercise only the zoning powers expressly delegated by the General Assembly under Title 22 of the Delaware Code, and the state's three counties — New Castle, Kent, and Sussex — zone all unincorporated land under Title 9. With only three counties and a comparatively small number of incorporated municipalities, county government plays an outsized role in Delaware land use compared to most states; large stretches of fast-growing Sussex and Kent County are governed by county zoning rather than a municipal code.

Historically, Delaware land-use regulation has been comparatively light-touch relative to neighboring states, which has contributed to rapid unincorporated growth in Sussex County in particular, alongside more built-out patterns in New Castle County near Wilmington. Unlike some neighboring states, Delaware has not enacted a statewide ADU mandate, missing-middle preemption, or by-right multifamily zoning law — land-use outcomes remain governed almost entirely by whichever county or municipal code applies to a given parcel.

For developers, this means Delaware zoning research is a two-step lookup: first confirm whether a parcel sits inside an incorporated municipality (and if so, which one) or in unincorporated county land, then consult that specific jurisdiction's own zoning ordinance and comprehensive plan, since there is currently no statewide overlay altering local zoning outcomes.

Who holds the zoning power

Land-use authority in Delaware is delegated by statute, not assumed — these are the acts a zoning ordinance in Delaware has to trace back to.

Municipalities zoning enabling authority Del. Code Title 22: Grants incorporated municipalities zoning and planning powers, typically exercised through individual municipal charters.
County Zoning Code Del. Code Title 9, Chapter 26: Governs county comprehensive planning and zoning for unincorporated New Castle, Kent, and Sussex counties; includes the county 'Quality of Life Act' provisions as Subchapter II.

Major cities and their codes

The enabling act sets the ceiling; the municipal code is what a project is actually reviewed against. The 6 largest Delaware jurisdictions and the codes they administer:

Delaware — municipal zoning codes
City	Zoning code
Wilmington	Wilmington Zoning Code State's largest city; ongoing redevelopment of former industrial riverfront parcels.
Dover	Dover Zoning Ordinance State capital, seat of Kent County; mix of state-government and suburban growth.
Newark	Newark Zoning Code University of Delaware anchor drives demand for multifamily and mixed-use near campus.
Middletown	Middletown Zoning Code One of the state's fastest-growing towns, largely built out through annexation and PUD agreements.
Milford	Milford Zoning Code Straddles Kent and Sussex counties, requiring coordination across two county zoning regimes.
Seaford	Seaford Zoning Code Western Sussex County hub with more conventional low-density zoning.

Parcel & GIS data

Delaware FirstMap, the state's enterprise GIS platform, publishes a statewide parcel layer (updated monthly from county data) alongside zoning and planning-cadastre datasets covering all three counties.

Parcel-level feasibility in Delaware waits on that data being ingested and the ordinances encoded — the waitlist below is what sets the order.

Zoning by city

The statute sets who may zone; the city's own code sets what you can build. One guide per Delaware city below, explaining the district codes that appear on its zoning map — 21 district codes across Delaware so far.

Delaware zoning — common questions

Does Delaware have county zoning?: Yes. Delaware has only three counties — New Castle, Kent, and Sussex — and each zones all unincorporated land within its borders under Title 9 of the Delaware Code. Incorporated municipalities zone separately under Title 22, so a parcel's governing code depends on whether it sits inside or outside an incorporated town.
Is Delaware a home-rule or Dillon's-rule state?: Delaware is a Dillon's Rule state: municipalities and counties may exercise only the land-use powers the General Assembly has expressly delegated to them, primarily under Title 22 of the Delaware Code for municipalities and Title 9 for the state's three counties, rather than drawing on a broad home-rule grant.
How do I look up zoning for a parcel in Delaware?: Delaware FirstMap, the state's official GIS portal, publishes a statewide parcel layer updated monthly from county assessor data, along with planning-cadastre datasets. For zoning district specifics, cross-reference with the applicable county or municipal zoning map.
Does Delaware have a statewide ADU or missing-middle housing mandate?: No. Unlike some neighboring states, Delaware has not enacted a statewide law requiring municipalities or counties to allow accessory dwelling units or missing-middle housing types by right. ADU and multifamily allowances vary entirely by the zoning code of the local county or municipality.

Working in Delaware? Get on the list.

The parcel layer lands in the order demand does. Illinois went first because that's where the deals were; the next state is decided by who tells us what they're trying to underwrite. Tell us where you're building and what you wanted to run — you'll hear from us when Delaware opens, and sooner if we need a test parcel.

Keep reading

← All 50 states

Want to see the finished shape of this work? Illinois is live at parcel level — Illinois zoning and the 53-district Chicago reference.

Delaware zoning summaries on this page are provided for information, not legal advice. Confirm every project against the current adopted code for the jurisdiction and the statute as amended.