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The land area of New Castle County, DE was 426 in 2018. The land area of Mercer County, NJ was 225 in 2018.

Land Area

Water Area

Land area is a measurement providing the size, in square miles, of the land portions of geographic entities for which the Census Bureau tabulates and disseminates data. Area is calculated from the specific boundary recorded for each entity in the Census Bureau's geographic database. Land area is based on current information in the TIGER® data base, calculated for use with Census 2010.

Water Area figures include inland, coastal, Great Lakes, and territorial sea water. Inland water consists of any lake, reservoir, pond, or similar body of water that is recorded in the Census Bureau's geographic database. It also includes any river, creek, canal, stream, or similar feature that is recorded in that database as a two- dimensional feature (rather than as a single line). The portions of the oceans and related large embayments (such as Chesapeake Bay and Puget Sound), the Gulf of Mexico, and the Caribbean Sea that belong to the United States and its territories are classified as coastal and territorial waters; the Great Lakes are treated as a separate water entity. Rivers and bays that empty into these bodies of water are treated as inland water from the point beyond which they are narrower than 1 nautical mile across. Identification of land and inland, coastal, territorial, and Great Lakes waters is for data presentation purposes only and does not necessarily reflect their legal definitions.

Above charts are based on data from the U.S. Census American Community Survey | ODN Dataset | API - Notes:

1. ODN datasets and APIs are subject to change and may differ in format from the original source data in order to provide a user-friendly experience on this site.

2. To build your own apps using this data, see the ODN Dataset and API links.

3. If you use this derived data in an app, we ask that you provide a link somewhere in your applications to the Open Data Network with a citation that states: "Data for this application was provided by the Open Data Network" where "Open Data Network" links to http://opendatanetwork.com. Where an application has a region specific module, we ask that you add an additional line that states: "Data about REGIONX was provided by the Open Data Network." where REGIONX is an HREF with a name for a geographical region like "Seattle, WA" and the link points to this page URL, e.g. http://opendatanetwork.com/region/1600000US5363000/Seattle_WA

Geographic and Area Datasets Involving Mercer County, NJ or New Castle County, DE

  • API

    Horseshoe Crab Spawning Survey

    data.delaware.gov | Last Updated 2022-10-06T19:41:25.000Z

    Delaware Bay shore survey data starting with 1999 which denotes peak spawning occurrences by day and lunar period, proportion of spawning in May (coinciding with shorebird stopovers), average water temperature, index values for female and male crabs per square meter by beach and bay-wide, the annual sex ratio, and index of abundance per beach.

  • API

    Total NJ Crash Records By County - No Private Properties

    data.nj.gov | Last Updated 2022-07-20T13:46:09.000Z

    Number of crashes that occurred in each of the 21 counties of New Jersey and the total number of crashes for the years 2001 to current. Crashes that occurred on private properties are not included.

  • API

    Total NJ Injury Crashes By County - No Private Properties

    data.nj.gov | Last Updated 2022-07-20T13:36:33.000Z

    Number of injury crashes that occurred in each of the 21 counties of New Jersey and the total number of injury crashes for the years 2001 to current. Injury crashes that occurred on private properties are not included.

  • API

    Well Permits

    data.delaware.gov | Last Updated 2024-05-28T09:43:46.000Z

    A listing of permits for water wells. The dataset includes information such as location (tax parcel), capacity, date and permit number. Specific location data, for some well types, is redacted per state law.

  • API

    NJ Construction Permit Data

    data.nj.gov | Last Updated 2024-05-10T19:11:37.000Z

    Data received as of 5/7/2024. N.J.A.C. 5:23-4.5 (d) requires municipalities to report to DCA monthly, information on each construction permit issued. Contains information about construction permits issued in New Jersey, including demolition permits. Data is collected from most, but not all municipalities that issue permits. It is processed and updated monthly. Data is purged from this dataset after 60 months have elapsed since the data was received. Accuracy of this data is not guaranteed, it may contain errors, and may not be complete. Data for permits issued in the immediate previous two months has not been reviewed. Note that this is the raw unaudited data, and may vary from the official published information in the monthly and annual Construction Reporter, as the official report contains corrected data, and the official report does not include updates received after the date of publication. We have no data for these municipalities: ALPHA WARREN 2102, ANDOVER BOROUGH SUSSEX 1901, LAKEHURST OCEAN 1513, NATIONAL PARK GLOUCESTER 0812, PINE BEACH OCEAN 1522, QUINTON SALEM 1711, VICTORY GARDENS MORRIS 1437, WINFIELD UNION 2021, WOODLYNNE CAMDEN 0437 Note: We've added Treasury Municipality Code to this dataset, and separated the Municipality Name in to Muni Name and Muni Type. Note 2: Questions on individual permit records should be directed to the office or agency which originally issued the permit. Note 3: This is raw data. An audited and summarized version of this infomation is available at https://www.nj.gov/dca/divisions/codes/reporter/building_permits.html . Note 4: Please be advised that this is the complete copy of our database. We do not have any additional fields for this data. We do not get property address, geocoding, owner names, type of work. What we have here is all we get. Any additional information would have to be requested from the agency which issued the permit.

  • API

    Hospitals

    fusioncenter.nhit.org | Last Updated 2023-07-28T21:44:56.000Z

    Point locations and limited attributes for hospitals of all types (acute care, rehabilitation, psychiatric, specialty), federally-qualified health centers, and satellite emergency departments, in New Jersey. Nursing homes and most standalone urgent care centers are not included. The point locations and most of the attributes are derived as periodic output from the NJ Department of Health (NJ DOH) Health Emergency Preparedness and Response (Hippocrates) system. Known as: Hospital point locations in New Jersey as of 2018-09 (Strc_emgy_hospital_3424)

  • API

    Citizen Statewide Lake Monitoring Assessment Program (CSLAP) Lakes

    data.ny.gov | Last Updated 2024-03-01T18:08:08.000Z

    The dataset represents the lakes participating in the Citizen Statewide Lake Monitoring Assessment Program (CSLAP). CSLAP is a volunteer lake monitoring and education program that is managed by DEC and New York State Federation of Lake Associations (NYSFOLA). The data collected through the program is used to identify water quality issues, detect seasonal and long term patterns, and inform volunteers and lake residents about water quality conditions in their lake. The program has delivered high quality data to many DEC programs for over 25 years.The dataset catalogs CSLAP lake information; including: lake name, lake depth, public accessibility, trophic status, watershed area, elevation, lake area, water quality classification, county, town, CSLAP status, years sampled, and last year sampled.

  • API

    Aquatic Biological Monitoring Sampling Locations: Beginning 1980

    data.ny.gov | Last Updated 2024-05-02T15:02:49.000Z

    The Division of Water Stream Biomonitoring Unit (SBU) dataset contains the point sampling locations at which benthic macroinvertebrates, field chemistry, and at some locations, sediment, fish or diatoms have been collected as part of the Rotating Integrated Basin Studies (RIBS) program, Rapid Biological Assessments (RAS), or special studies. The data collected are used for water quality assessment (input to the Waterbody Inventory, completion of the 305(b) report and 303(d) list of impaired Waters) and for track-down of water quality problems. The data set is maintained by the Division of Water, Bureau of Water Assessment and Management, Stream Biomonitoring Unit.

  • API

    Waste Tire Abatement Sites

    data.ny.gov | Last Updated 2022-08-12T17:59:04.000Z

    Information on designated waste tire abatement sites in New York State, including approximate size, location, and abatement status.

  • API

    SPDES Multi-Sector General Permit (MSGP) Facilities

    data.ny.gov | Last Updated 2023-04-14T19:16:46.000Z

    The SPDES Multi-Sector General Permit (MSGP), which is administered by the Department of Environmental Conservation (the Department), regulates stormwater discharges associated with industrial activity from a point source. The MSGP covers thirty one different industrial sectors which include activities such as mining, land transportation, and scrap recycling. The dataset displays information on facilities that have active MSGP coverage in New York State. Information included in the data set include the facility’s name, address, contact information, industrial sector(s), discharging waterbody, and location of the facility’s Stormwater Pollution Prevention Plan. For more information, please go to http://www.dec.ny.gov/chemical/62803.html.