GIS Map

Sac County, Iowa GIS Map

This GIS map of Sac County, Iowa (IA) shows the official Census county boundary (FIPS 19161), with federal layers you can switch on for FEMA flood zones, USGS elevation contours and hillshade, NLCD land cover, and school district lines.

Sac County has a population of about 9,689 (U.S. Census Bureau, 2020-2024 ACS 5-year estimate) and a land area of 575 square miles. Use the inspect tool to read coordinates, elevation and the layers under any point.

State
Iowa (IA)
Population
9,689
Land area
575 sq mi
Density
17 / sq mi
Coordinates
42.3875, -95.1052
FIPS code
19161

Sac County Demographics

Source: U.S. Census Bureau, American Community Survey 2020-2024 5-year estimates.

Population

9,689

Households

4,302

Median household income

$73,838

Median age

46.2 years

Median home value

$141,400

Median gross rent

$722/mo

Owner-occupied homes

78%

Bachelor's degree or higher

22.3%

Below poverty level

9.2%

Land area

575 sq mi

Population density

17 / sq mi

Iowa rankings

Richest citiesMost expensive homesMost affordable homesHighest rentMost educatedHighest poverty rateMost densely populatedLargest by population

Sac County Population Growth

Source: U.S. Census Bureau, 2010 Census and Population Estimates Program (Vintage 2024: April 2020 estimates base and July 1, 2024 estimate).

2010 Census

10,350

April 2020 (estimates base)

9,823

July 2024 estimate

9,533

Change 2010-2020

-5.1%

Change 2020-2024

-3.0%

Natural Hazard Risk in Sac County

FEMA National Risk Index ratings for Sac County, compared with all U.S. counties.

Overall risk

Very Low

Score 27.3 of 100

Expected annual loss

$14,739,401

Buildings, population & agriculture

Social vulnerability

Very Low

Susceptibility to hazard impacts

Community resilience

Very High

Ability to prepare & recover

Risk by Hazard

  • DroughtRelatively High
  • HailRelatively Moderate
  • TornadoRelatively Low
  • Ice StormRelatively Low
  • Cold WaveRelatively Low
  • Winter WeatherRelatively Low
  • Strong WindRelatively Low
  • LandslideVery Low
  • Inland FloodingVery Low
  • Heat WaveVery Low
  • LightningVery Low
  • EarthquakeVery Low
  • WildfireVery Low

Source: FEMA National Risk Index (December 2025 release). County-level ratings are relative to other U.S. counties and are not a property-specific assessment.

Environmental Conditions in Sac County, Iowa

Radon potential, monitored air quality and current drought status for Sac County, Iowa, from the Environmental Protection Agency and the U.S. Drought Monitor.

Radon potential

Zone 1

highest radon potential

EPA predicts an average indoor level at or above 4 pCi/L, so the EPA recommends a radon test for every home in this zone, and a mitigation system for new construction.

Drought status

No drought

Drought Severity and Coverage Index 0 of 500.

Map of 13 October 2026.

Sources: EPA Map of Radon Zones (September 2025), EPA Air Quality Index (2024) and the U.S. Drought Monitor. A radon zone is a regional planning tool, not a prediction for any individual home — the EPA recommends testing every home regardless of zone. Air quality is shown only for counties that host an EPA monitor. Drought figures describe one weekly map, not a long-term climate average. Compare counties in Iowa.

GIS Data for Sac County, IA

The Sac County GIS map on this page loads live federal layers in your browser, so you can check flood zones, terrain, land cover and district boundaries anywhere in Sac County without a separate GIS login. All of the Sac GIS data below is drawn from public U.S. government sources.

Layers you can turn on

  • FEMA flood zones

    National Flood Hazard Layer — flood insurance rate map zones and floodways.

  • Elevation contours and hillshade

    USGS 3DEP terrain, so you can read slope and relief across the county.

  • Land cover

    NLCD land cover classes — forest, developed, wetland and water.

  • School districts

    Census TIGER unified and elementary school district boundaries.

  • ZIP code and county boundaries

    Census TIGER ZCTA and county boundary lines.

Map tools

  • Measure distance and area

    Draw a line or polygon to get length in miles or area in acres.

  • Sketch and annotate

    Add points, lines and shapes on top of the map.

  • Inspect any point

    Click the map to read coordinates, elevation and the layers under your cursor.

  • Download the map

    Save the current view as a PNG image.

Where the data comes from

County boundaries come from the U.S. Census Bureau TIGER/Line program, flood zones from FEMA's National Flood Hazard Layer, terrain from the USGS 3D Elevation Program, land cover from the Multi-Resolution Land Characteristics Consortium, and demographics from the American Community Survey.

Property records and tax maps in Sac County

Most people who look up Sac County GIS data are after parcel-level records: who owns a property, what it last sold for, and what it is assessed at. Those records are kept locally, not federally, so they are not part of this map. Sac County property and tax map data lives with the county's own records office, and what that office is called varies by state — Texas counties run an appraisal district (usually searched as a “CAD”), Kentucky uses a Property Valuation Administrator (PVA), and most other states use a county assessor, auditor or tax office. Start with that office for a deed, a tax map number or a parcel boundary; use the map above for flood zones, elevation and land cover on the same land.

Sac County FAQ

What state is Sac County in?

+

Sac County is a county in Iowa (IA).

What is the population of Sac County?

+

Sac County, Iowa has a population of about 9,689, according to the U.S. Census Bureau American Community Survey.

How big is Sac County?

+

Sac County covers about 575 square miles of land, with a population density of roughly 17 people per square mile.

What is the FIPS code for Sac County?

+

The FIPS county code for Sac County, Iowa is 19161. It is used to identify the county in federal datasets such as Census TIGER and FEMA flood maps.

What is the median household income in Sac County?

+

The median household income in Sac County, Iowa is about $73,838 per year.

What is the radon zone for Sac County?

+

Sac County is in EPA radon Zone 1, meaning the EPA predicts an average indoor radon level at or above 4 pCi/L. In this zone the EPA recommends a radon test for every home in this zone, and a mitigation system for new construction. The EPA is clear that a radon zone is a regional planning tool and not a prediction for any individual home.

Is Sac County in a drought?

+

As of the 13 October 2026 U.S. Drought Monitor map, no part of Sac County is in drought.

What is Sac GIS?

+

Sac GIS usually refers to the county's own parcel and zoning mapping system, which Sac County publishes itself. This page is a separate, free viewer: it draws federal GIS layers — FEMA flood zones, USGS elevation, NLCD land cover and Census boundaries — over the Sac County boundary, with no login required.

What GIS data is available for Sac County?

+

The Sac County map loads federal GIS layers directly in your browser: FEMA National Flood Hazard Layer flood zones, USGS 3DEP elevation contours and hillshade, NLCD land cover, Census TIGER school district boundaries, and TIGER ZIP code and county boundary lines.

How do I check flood zones in Sac County?

+

Open the Sac County map, turn on the FEMA flood zones layer, and zoom in. The National Flood Hazard Layer shows flood insurance rate map zones and floodways. Flood zones only draw once you are zoomed in far enough.

How do I find the coordinates or elevation of a spot in Sac County?

+

Use the inspect tool on the Sac County map and click any point. It reads back the coordinates, elevation and the layers under your cursor. You can also measure distance and area by drawing a line or polygon.

Data sources for Sac County, Iowa

Every figure on this page comes from a published government dataset. Each source is listed with its release date so you can check the number or cite it directly.

  • American Community Survey 5-year estimates

    U.S. Census Bureau · 2020-2024 · population, income, housing, education and poverty figures

  • Gazetteer Files

    U.S. Census Bureau · 2024 · place coordinates, land area and the county/place/ZIP crosswalk

  • TIGER/Line Shapefiles

    U.S. Census Bureau · 2024 · county, ZIP Code Tabulation Area and school district boundaries

  • National Flood Hazard Layer

    Federal Emergency Management Agency · current effective Flood Insurance Rate Maps · flood zones, floodways and base flood elevations

  • National Risk Index

    Federal Emergency Management Agency · v1.20, December 2025 · county natural hazard risk, expected annual loss, social vulnerability and resilience

  • 3D Elevation Program (3DEP)

    U.S. Geological Survey · current · elevation contours, shaded relief and point elevations

  • National Land Cover Database

    Multi-Resolution Land Characteristics Consortium · NLCD 2021 · land cover classes such as developed, forest, crop and water

  • Map of Radon Zones

    U.S. Environmental Protection Agency · September 2025 · the county radon zone (1, 2 or 3) and its predicted indoor radon potential

  • Air Quality Index annual summary by county

    U.S. Environmental Protection Agency · 2024 · median, 90th percentile and peak AQI, and days at unhealthy levels, for counties with an EPA monitor

  • U.S. Drought Monitor

    National Drought Mitigation Center, USDA and NOAA · weekly, current map · the share of county area in each drought category and the Drought Severity and Coverage Index

  • ArcGIS basemaps

    Esri · current · streets, satellite, topographic and dark gray basemap tiles

Citing this page

GIS Map, “Sac County, Iowa GIS Map”, https://gismap.land/county/iowa/sac. Figures from the datasets listed above.

How GIS Map sources and labels its data

Local notes for Sac County, IA

Questions and local knowledge from people who know the area. Every note is read before it appears here.