Why does Chicago have over 1,500 zoning districts?

Two mechanisms. Each planned development is individually numbered and becomes its own district, and the conventional districts use a two-part code where each family is repeated at several intensities.

How do you read a Chicago zoning code?

The letters identify the family, such as RS for residential single unit, RT for two flat and townhouse, RM for residential multi unit, B for business, C for commercial and M for manufacturing. The following numbers set the intensity.

What are Planned Manufacturing Districts?

Individually numbered districts covering thousands of acres that exist to protect industrial land from residential conversion. They are an explicit policy choice written into the zoning map rather than a general industrial category.

Which are the largest zoning districts?

RS-3 at roughly 28,790 acres and RS-2 at about 27,645, both residential single unit districts. Together they cover more than every other district combined among the larger classifications.

What does a PD district code mean?

That the parcel sits in a planned development identified by number. The binding standards are in that project's approval rather than in a citywide district table, so the number is a reference to a document.

Chicago Zoning Intelligence

Zoning, permitted uses, and development potential for Chicago, Illinois. 1519 districts with their permitted uses and building controls.

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City Context

How is Chicago zoned?

Chicago has 1,519 zoning districts, by far the largest count of any city in this dataset, and two mechanisms explain nearly all of it.

The first is planned developments. Each is individually numbered, so districts appear as PD followed by a number, and every approved project becomes its own district on the map. A code beginning with PD is a reference to that project's approval rather than to a general set of standards.

The second is the two-part code used across the conventional districts. A letter group identifies the family, RS for residential single unit, RT for two flat, townhouse and multi unit, RM for residential multi unit, B for business, C for commercial, M for manufacturing, and a following number pair sets the intensity. RS-3 and RS-2 are the two largest districts in the city at roughly 28,790 and 27,645 acres.

One family is distinctive to Chicago: the Planned Manufacturing Districts, individually numbered and covering thousands of acres. They exist to protect industrial land from residential conversion, which is an explicit policy choice written into the zoning map rather than a general industrial category.

Parks And Open Space covers roughly 10,214 acres. Heavy industry covers about 5,278 acres and the limited manufacturing and business park districts several thousand more. This is pre-development intelligence, not legal advice - verify with the local planning department before acquisition.

Zoning Districts

Chicago, Illinois Zoning Districts: What Do They Mean?

Zoning districts are areas regulated by specific laws that determine land use, building types, and development rules. Each district below shows its zone type. Chicago's ordinance does not state permitted uses as citywide flags, so they are read from each district's own table rather than summarised here.

Zone Code	Zone Type	Area
RS-3 Residential Single Unit District	-	28,789.7 ac
RS-2 Residential Single Unit District	-	27,645.1 ac
RT-4 Residential Two Flat Townhouse And Multi Unit District	-	11,351 ac
POS-1 Parks And Open Space	-	10,214.1 ac
PD-0 Planned Developments	-	6,608.9 ac
M3-3 Heavy Industry District	-	5,277.8 ac
RM-5 Residential Multi Unit District	-	3,695.1 ac
PMD-6 Planned Manufacturing Districts	-	3,374.3 ac
RS-1 Residential Single Unit District	-	3,328 ac
M1-2 Limited Manufacturing And Business Park District	-	3,253.7 ac
B3-2 Community Shopping District	-	2,776.3 ac
B3-1 Community Shopping District	-	2,659.7 ac
M1-1 Limited Manufacturing And Business Park District	-	2,357.4 ac
M2-2 Light Industry District	-	1,522.3 ac
C1-2 Neighborhood Commercial District	-	1,445.8 ac
M2-3 Light Industry District	-	1,436.8 ac
B1-1 Neighborhood Shopping District	-	1,340.9 ac
PMD-8 Planned Manufacturing Districts	-	1,332.8 ac
C1-1 Neighborhood Commercial District	-	964.6 ac
PMD13 Planned Manufacturing Districts	-	901.7 ac

Building Controls

What are the building controls in Chicago?

Setback, height, FAR, lot area, and density controls enforced across Chicago zoning districts.

Building height
Coverage
Density
FAR
Front setback
Lot
Lot width
Multi
Pervious
Rear setback
Side setback

Other Illinois cities

Chicago zoning: frequently asked questions

Why does Chicago have over 1,500 zoning districts?: Two mechanisms. Each planned development is individually numbered and becomes its own district, and the conventional districts use a two-part code where each family is repeated at several intensities.
How do you read a Chicago zoning code?: The letters identify the family, such as RS for residential single unit, RT for two flat and townhouse, RM for residential multi unit, B for business, C for commercial and M for manufacturing. The following numbers set the intensity.
What are Planned Manufacturing Districts?: Individually numbered districts covering thousands of acres that exist to protect industrial land from residential conversion. They are an explicit policy choice written into the zoning map rather than a general industrial category.
Which are the largest zoning districts?: RS-3 at roughly 28,790 acres and RS-2 at about 27,645, both residential single unit districts. Together they cover more than every other district combined among the larger classifications.
What does a PD district code mean?: That the parcel sits in a planned development identified by number. The binding standards are in that project's approval rather than in a citywide district table, so the number is a reference to a document.

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Zoning data is pre-development intelligence, not legal advice. Verify with the Chicago planning department before acquisition or design.