What Is an Enumeration District on a Census Record?

Understanding enumeration districts can help you find ancestors who don't show up in name searches, browse census records by neighborhood, and understand how census records were originally collected. This guide explains everything you need to know.

What Is an Enumeration District?

An enumeration district is a geographic area assigned to a single census taker (enumerator) for the purpose of collecting census data. Each ED was small enough that one person could cover it on foot within the census period (usually 2-4 weeks).

Think of an enumeration district as a delivery route — the census taker walked (or rode) through a specific area, knocked on every door, and recorded every person who lived there.

How EDs Were Assigned

• In cities, an ED might cover a few city blocks
• In rural areas, an ED might cover an entire township or several small villages
• In 1920 and later, EDs were numbered sequentially within each county
• Each ED had a unique number, and census records are organized by state, county, and ED number

Why EDs Exist

The census couldn't be collected all at once by one person. The government divided the country into manageable pieces — enumeration districts — and assigned one census taker to each. This is why census records are organized geographically rather than alphabetically.

Why Enumeration Districts Matter for Genealogy

1. Finding Ancestors Who Don't Appear in Name Searches

Name indexes (like those on FamilySearch and Ancestry) rely on transcribers reading handwritten names correctly. If your ancestor's name was misspelled, misread, or the handwriting was unclear, they may not appear in a name search.

But they're still in the census — on the page where the enumerator recorded them. If you know their address or neighborhood, you can find their ED and browse the census pages for that district, looking for them visually. This is called "browsing by ED" and it's one of the most powerful techniques for finding elusive ancestors.

2. Browsing a Neighborhood

Even if you find your ancestor through a name search, browsing the entire enumeration district reveals their neighbors. This matters because:

• Families often lived near relatives — your ancestor's siblings, in-laws, or parents may be a few houses away
• Chain migration — immigrants often settled near people from the same hometown
• Future spouses — many couples lived in the same neighborhood before marriage

3. Understanding the Census Page

Each census page includes the ED number, along with the sheet number, at the top. When you cite a census record, you include the ED number and sheet number so others can find the exact page you referenced. For more on citing sources, see our genealogy organization guide.

How to Find an Enumeration District

If You Know the Address

If you know where your ancestor lived (from a city directory, family records, or a previous census), you can find the corresponding ED:

1. Use the ED Finder at the National Archives or Stephen Morse's One-Step tool (stevemorse.org)
2. Enter the state, city, and street name
3. The tool will identify the ED number(s) for that location
4. Browse the census pages for that ED on FamilySearch or the National Archives

If You Know the County but Not the Address

1. Search the census index by surname within that county
2. Note the ED number from any matching record
3. Browse adjacent EDs in the same county to look for nearby relatives

If You're Using FamilySearch

FamilySearch lets you browse census records by state, county, and ED number:

1. Go to the census collection page
2. Select "Browse All Images"
3. Navigate to State > County > ED number
4. Page through the images for that ED

What's on the ED Description Sheet

At the beginning of each enumeration district's records, there's a description sheet that tells you:

• The ED number
• The boundaries of the district (streets, rivers, city limits)
• The enumerator's name
• The date the enumeration was conducted
• The number of dwelling units and people recorded

This description helps you confirm you're looking in the right district and understand its geographic boundaries.

Enumeration Districts and the 1950 Census

The 1950 census (the most recently released U.S. census) introduced a change: enumeration districts were replaced by enumeration districts and census tracts in larger cities. But the concept is the same — the census is organized by geographic area, and knowing the ED helps you find records.

The National Archives released the 1950 census on April 1, 2022, with a name index. But for people whose names were misspelled or missed by the index, browsing by ED remains the primary method of finding them.

Using EDs with Maps

Enumeration districts correspond to geographic areas, which means you can map them. Understanding where an ED was located helps you:

• Visualize your ancestor's neighborhood
• Identify which records office holds local documents
• Understand migration patterns within a city or county

For more on using maps in genealogy, see our family history mapping guide.

A Practical Example

Let's say you're looking for Patrick O'Brien in the 1920 census in Cleveland, Ohio. A name search returns no results — the enumerator may have written "Brien" without the O', or "O'Brain," or the handwriting may have been misread by the indexer.

You know from a 1919 city directory that Patrick lived at 1420 West 25th Street. Here's what you do:

1. Go to Stephen Morse's ED Finder (stevemorse.org)
2. Enter: Ohio > Cleveland > West 25th Street
3. The tool returns ED 185 for that area in the 1920 census
4. Go to FamilySearch and browse the 1920 census: Ohio > Cuyahoga County > ED 185
5. Page through the images, looking at the street names in column 1
6. Find West 25th Street, then find house number 1420
7. There's Patrick — listed under a misspelled name the indexer couldn't read

This technique works for any census year, any city, and any ancestor — as long as you know approximately where they lived.

FAQ

What is an enumeration district?

An enumeration district (ED) is a geographic area assigned to a single census taker. The census was collected by dividing the country into these small districts, each covered by one enumerator. Every census record includes the ED number it was recorded in.

How do I find the enumeration district for my ancestor?

If you know their address, use the National Archives ED Finder or Stephen Morse's One-Step ED Finder (stevemorse.org). Enter the state, city, and street to get the ED number. If you don't know the address, search by name on FamilySearch and note the ED from any matching record.

Why would I browse by enumeration district instead of searching by name?

Name indexes sometimes miss entries due to handwriting misreads, misspellings, or transcription errors. Browsing by ED lets you look at the original census pages for a specific area, finding ancestors the index missed. It's the most reliable method for finding elusive ancestors.

Where can I access census records by enumeration district for free?

FamilySearch and the National Archives both offer free access to census records, including browsing by state, county, and ED number. For more free resources, see our finding ancestors without paying guide.

Do other countries use enumeration districts?

Yes, many countries that conducted censuses used similar geographic divisions. UK census records are organized by registration district, enumeration district, and piece number. The concept is the same — the census is collected by dividing the country into manageable geographic areas.

How do I cite a census record using the ED number?

A standard citation includes: census year, state, county, ED number, sheet number, and household/family number. Example: "1920 U.S. Census, Cuyahoga County, Ohio, ED 185, sheet 4B, household 92, Patrick O'Brien household; digital image, FamilySearch." For more on source citation, see our genealogy organization guide.

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