Howard County Logo
Data Download and Viewer
Welcome to the Howard County, Maryland data download and viewer page. This page contains a growing repository of information provided by various county departments for use by the general public. For more interactive and static maps, please click on the Map and Data Tools tab

Below are our three primary applications. For over a dozen additional applications and viewers choose the "Map and Data Tools" tab.

My Neighborhood

Find a Howard County address and view detailed information about it including nearby public facilities.

Click for My Neighborhood

Interactive Map

Load and overlay different county datasets on an interactive map. For more advanced users.

Click for Interactive Map

Map Gallery

View general-purpose PDF maps generated by various county agencies for easy printing.

Click for Map Gallery

The datasets listed on this page come from one of two sources:
  • Datasets listed in green come from the county's GIS division.
  • Datasets listed in blue come from the county's open data portal.

The following tools were designed to help citizens navigate the county's datasets interactively.

Address List Generator
Address List Generator Logo
Draw a shape or create a buffer and generate a list of all addresses in that shape or buffer. You create an address mailing list from the resulting data using other software.

Link To Website
Aerial Photography Map Viewer
Aerial Viewer Logo
View historic and current aerial photography from 1943 to the present in this easy to use application.

Link To Website
Columbia - Final Development Plans
FDP App Logo
View and download Final Development Plans (FDP) for Columbia New Town Zoning.

Link To Website
Community Registration Map
Community Registration Logo
Use Community Registration to define a community boundary and a notification boundary to receive notifications via email with information regarding the pre-submission community meeting in your area.

Link To Website
Construction Projects Map
Constructions Project Logo
Displays current and archived construction project sites and related information including press releases, contacts, and images. Projects are maintained by the Department of Public Works and Recreation and Parks. This application is mobile friendly.

Link To Website
Crime Statistics Map
Crime Statistics Logo
View census data on a map grouped by census block.

Link To Website
Development Plans + Public Meetings Map
Development Plans Logo
Find public meetings or view current and past development plans near a specific address on a Google map. Download plan documents and contact relevant planners and engineers.

Link To Website
Geodetic Survey Control Map
Geodetic App Logo
Find Geodetic Benchmarks and Stations around Howard County. View linked scanned recovery cards for more detail and relevant coordinate information.

Link To Website
Green Infrastructure Map
Green Infrastructure Logo
Green Infrastructure is an interconnected network of: waterways, wetlands, woodlands, wildlife habitats, natural areas, and working farms and forests, that support native species, maintain natural ecological processes, sustain air and water resources, and contribute to the health and quality of life for communities and people.

Link To Website
Health Inspections
Health Inspections Logo
This website provides you with access to inspection reports for each of the facilities the Howard County Health Department licenses.

Link To Website
Healthy Howard Restaurant Map
Healthy Howard Logo
Find a Healthy Howard designated restaurant on a Google map and view the healthy items on the menu.

Link To Website
Historic Sites Viewer
Historic Sites Logo
View historic sites and districts and download related documentation.

Link To Website
Howard County Government Campus Arboretum
HC Arboretum Logo
A wonderful assortment of trees has been planted around this complex of county office buildings. The interactive map will help you locate and identify these trees and retrieve more information.

Link To Website
Map Gallery
Map Gallery Logo
View general-purpose PDF maps generated by various county agencies.

Link To Map Gallery
Map Gallery Bin
Map Gallery Bin Logo
The Map Gallery Bin was created as respository for custom maps created by various county agencies for particular projects. It contains a dynamic search to help filter through the maps you want.

Link To Map Gallery Bin
My Neighborhood
My Neighborhood Logo
Find an Howard County address and view detailed information about it including nearby public facilities. Also, view the address and related information on a Google map.

Link To Website
Preservation Easements
Preservation Easements Logo
Find Preservation easements througout Howard County. Easements include various Agricultural, Environmental, Preservation, and Historic easements and trusts.

Link To Website
Voter Information Map
Voter Information Logo
This Google Map application lets you key in an address and return the relevant polling location as well as driving directions to that polling location.

Link To Website

OpenHoward Web Services

Socrata Web Services
To access the Socrata API documentation, click below:

Link to SODA documentation

GIS Web Services

Howard County publishes about 180 datasets as both WMS (Web Map Service) and WFS (Web Feature Service) layers for use on its own websites and for use by the general public. These web services are used by the county in many of the websites listed on the "Map and Data Tools" tab as well as the interactive map on the "Welcome" tab.

Web Map Services
A Web Map Service (WMS) is a standard protocol for serving georeferenced map images over the Internet that are generated by a map server using data from a GIS database. The specification was developed and first published by the Open Geospatial Consortium in 1999. (Source: Wikipedia)

WMS Service Link WMS Capabilities Document
Web Feature Services
The Open Geospatial Consortium Web Feature Service (WFS) Interface Standard provides an interface allowing requests for geographical features across the web using platform-independent calls. (Source: Wikipedia)

WFS Service Link WFS Capabilities Document
GIS Support Web Services
These web services are .NET-based .asmx web services that power some of our interactive mapping applications. They include the following:
  • Generate List of Streets
  • Generate Street Intersections
  • Query ADC Map Grid
  • Query Address Points
  • Query Property by Map/Parcel/Lot
  • Query Property by Plat Number
  • Query Property by Tax ID
  • Query Scanned Drawings By Name
  • Query Scanned Drawings By Number
Data Explorer Service Link
Howard County maintains strong data sharing relationships with surrounding local jurisdictions as well as the state and Federal government. These are data access resources provided by other government agencies and non profit organizations that might be helpful and/or supplemental to the data provided on this website.

Federal Resources
  • Data.Gov
  • Ramona GIS Inventory - RAMONA tracks data availability and the status of geographic information system (GIS) implementations in state and local governments to aid the planning and building of Spatial Data Infrastructures. This is the primary location to locate more complete metadata about Howard County's GIS layers as well as metadata for state and federal GIS layers.
Other Organizations
  • Code For America- Code for America helps governments become more transparent, connected, and efficient by connecting web developers with people who deliver city services, and through that process, we are growing the corp of tech-savvy citizens working to better our communities.
  • Sunlight Foundation - The Sunlight Foundation is a non-profit, nonpartisan organization that uses the power of the Internet to catalyze greater government openness and transparency, and provides new tools and resources for media and citizens, alike.
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