1951
Six zoning districts:
Residential (4): Yellow, Orange, Brown, Black
Business: Red
Industry: Purple
1952
Eleven zoning districts: Estates, Residential (4), Commercial, Recreational & Parks, Agricultural, Institutional, Industrial, & Utilities (see legend)
1985
Marked up township street map, legend unavailable.
2018
30 classes of zoning districts (see legend):
Agricultural District: AG
Recreational Area District: R-A
Residential District: R-1A, R-1, R-2A, R-2, G, HR, R-3, R-3A, R-3B, U-R, R-55A, R-55B
Administrative and Research: AR, AR-1
Commercial Office: C-O
Neighborhood Commercial: NC
Limited Commercial: LC
General Commercial: GC
Shopping Center: SC
Suburban Metropolitan: SM, SM1
Limited Industrial: LI
Heavy Industrial: HI
Floodplain Conservation: FP
Garden Apartments: GR
Steep Slope: SS
Cluster Development Overlay: CDO
King of Prussia Mixed-Use: KPMU
(Source: Upper Merion Township Zoning Codes & Map)
1951 Upper Merion Township Zoning Map
