William Decker — US Census Records & Model Tree
We found 3835 free census records for William Decker across 6 census years (1900–1950), in 50 states and DC and 781 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.
William Decker Census Records by State & County
Census Record Search
| Year | Name | Age | Location | Birthplace | Occupation | Relation |
|---|---|---|---|---|---|---|
| 1940 | William Decker | 25 | Essex-County, New Jersey | New Jersey | Press Operator | Son |
| 1940 | William S. Decker | 21 | Scott-County, Iowa | Indiana | — | Son |
| 1940 | William Decker | 22 | Kings-County, New York | New York | Fisherman | Son |
| 1930 | William Decker | Adams, Illinois | Ohio | Farm Laborer | Head | |
| 1940 | William Decker | 40 | Passaic-County, New Jersey | Holland | Shipping Clerk | Head |
| 1940 | William Decker | 59 | Washington-County, Illinois | Illinois | Farmer | Head |
| 1940 | William Decker | 52 | Manitowoc-County, Wisconsin | Wisconsin | Farmer | Head |
| 1910 | William Decker | Richmond, New York | New York | Farmer | Head | |
| 1930 | William Decker | Luzerne, Pennsylvania | Pennsylvania | Merchant | Son | |
| 1920 | William J. Decker | Bureau, Illinois | Illinois | None | Son | |
| 1930 | William Leon Decker | Marion, Illinois | Illinois | — | Son | |
| 1940 | William Decker | 25 | Orleans-County, Louisiana | Louisiana | Porter | Son |
| 1930 | William Decker | Ohio, Kentucky | Kentucky | — | Son | |
| 1940 | William Decker | 17 | Philadelphia-County, Pennsylvania | Pennsylvania | — | Son |
| 1940 | William E. Decker | 16 | Broome-County, New York | New York | Salesman | Son |
| 1940 | William Decker | 47 | Orleans-County, Louisiana | Texas | Ice Route | Head |
| 1930 | William Decker | Passaic, New Jersey | Holland | Baker | Head | |
| 1930 | William Decker | Clark, Ohio | Ohio | None | Son | |
| 1930 | William Decker | Vanderburgh, Indiana | Indiana | — | Son | |
| 1940 | William Decker | 15 | Lehigh-County, Pennsylvania | Pennsylvania | — | Son |
| 1910 | William L. Decker | Lycoming, Pennsylvania | Pennsylvania | Laborer | Head | |
| 1910 | William P Decker | Berrien, Michigan | Ohio | Laborer | Head | |
| 1940 | William Decker | 12 | Broome-County, New York | New York | — | Son |
| 1930 | William Decker | Richmond, New York | New York | Butcher | Son | |
| 1930 | William Decker | Botetourt, Virginia | Virginia | — | Son | |
| 1900 | William Decker | 48 | Kings, New York | New York | Teamster (Casing Co) | Head |
| 1940 | William Decker | 46 | Cook-County, Illinois | New York | Cylinder Pressman | Head |
| 1940 | William C. Decker | 14 | Laclede-County, Missouri | Missouri | — | Son |
| 1930 | William H Decker | Luzerne, Pennsylvania | Pennsylvania | — | Head | |
| 1910 | William M. Decker | Cook, Illinois | Massachusetts | Meat Market | Head |
About William Decker US Census Records & Model Tree
We've indexed 3835 free, proprietary US Census records for William Decker across 1900–1950, covering 50 states and DC: Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming.
Each record includes our Model Tree — a longitudinal reconstruction that links the same person across census decades using machine learning (XGBoost record linkage). Every link carries a confidence score: Verified (≥0.99), Confirmed (≥0.95), or Linked (lower confidence). This tells you not just what the census says, but how reliably we've connected records across time.
Every record also shows the full household — who William lived with, their ages, birthplaces, and occupations. For 1940 and 1950 records, you can view the original handwritten census page from the National Archives.
Last updated: July 30, 2026
Frequently Asked Questions
- We have 3835 US Census records for William Decker, from 1900 to 1950, across 50 states and DC.
- You'll see William's age, birthplace, occupation, and relationship to the head of household — plus everyone else who lived in the same home. For 1940 and 1950 records, you can also view the original handwritten census page.
- Census records are a snapshot of a family every 10 years. You can follow William Decker's household over time — see when children appear, when people move states, and who's living together. YourRoots connects census data with Tree Matching and AI tools so you can build out your tree faster.
- Yes. All William Decker census records on YourRoots are free to search and view — no subscription required. We built our own index from the original federal census images.
- We have William Decker records from the 1900 through 1950 US Federal Census, across 50 states and DC. Use the year and state filters above to narrow your results.
- Start by narrowing the year and state. If you know an approximate birth year, use the age column to match — census age minus the census year gives you a birth year estimate. Household members, birthplace, and occupation help confirm you have the right person.
- The Model Tree is YourRoots' unique feature that links a person across multiple census decades and reconstructs their likely family — parents, siblings, spouse, and children — based on household patterns. It turns isolated records into a connected family network.
- All records originate from the US Federal Census microfilm digitized by NARA (National Archives and Records Administration). YourRoots re-indexed the original page images using modern AI, catching names and details that older transcriptions missed.