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William Decker — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this William Decker across the 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1923), then head of a 8-person household.
Age 17
b. ~1923
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | Decker |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Philadelphia |
| 1935 Residence (County) | Philadelphia |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H 3 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Philadelphia |
| Est. Birth Year | ~1923 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Lillian Decker | Daughter | — | 9 | ~1931 |
| William Decker | Son | — | 17 | ~1923 |
| Charles Decker | Son | — | 20 | ~1920 |
| Frederick Decker | Son | — | 14 | ~1926 |
| Pauline Decker | Spouse | — | 37 | ~1903 |
| Donald Decker | Son | — | 3 | ~1937 |
| Julius Decker | Head | — | 35 | ~1905 |
| Julius Decker | Son | — | 7 | ~1933 |
Census Appearances
1930
Philadelphia, Pennsylvania
Son, age 7
Philadelphia, Pennsylvania · implied b. ~1923 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Decker |
| Given Name | William H. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Philadelphia-County, Pennsylvania
Son, age 17
Philadelphia-County, Pennsylvania · implied b. ~1923 — 8 household members
| Surname | Decker |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Philadelphia |
| 1935 Residence (County) | Philadelphia |
| Income (1939) | 0 |
| Highest Grade | H 3 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links William Decker across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Decker
Son · 1940 · age 17 · b. ~1923 · Pennsylvania
★ You are viewing this record
Sibling
Charles Decker
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Decker
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Julius Decker
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frederick Decker
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lillian Decker
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Philadelphia-County, Pennsylvania
Open full size
1940 US Federal Census — Philadelphia-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03697-00842)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Genevieve Smolak | 19 | Daughter | Turner | Pennsylvania |
| 2 | Stanley Smolak | 17 | Son | — | Pennsylvania |
| 3 | Julius Decker | 35 | Head | Laborer | Germany |
| 4 | Pauline Decker | 37 | Wife | — | Austria |
| 5 | Charles Decker | 20 | Son | Operator | Pennsylvania |
| 6 | William Decker THIS PERSON | 17 | Son | — | Pennsylvania |
| 7 | Frederick Decker | 14 | Son | — | Pennsylvania |
| 8 | Lillian Decker | 9 | Daughter | — | Pennsylvania |
| 9 | Julius Decker | 7 | Son | — | Pennsylvania |
| 10 | Donald A. Decker | 3 | Son | — | Pennsylvania |
| 11 | Mary Roehr | 70 | Head | — | Pennsylvania |
| 12 | Joanna B. Fritz | 39 | Daughter | Teacher | Pennsylvania |
| 13 | George Schneider | 55 | Head | Watchman | Austria |
| 14 | Magdalene Schneider | 52 | Wife | — | Austria |
| 15 | Frank Schneider | 30 | Son | Presser | Pennsylvania |
| 16 | Catherine Schneider | 25 | Daughter | — | Pennsylvania |
| 17 | Mary Schneider | 23 | Daughter | Seamer | Pennsylvania |
| 18 | Nick Schneider | 21 | Son | Knitter | Pennsylvania |
| 19 | George Schneider | 19 | Son | Cleaning | Pennsylvania |
| 20 | John Mcgrany | 32 | Head | Regulator | Pennsylvania |
| 21 | Marie Mcgrany | 31 | Wife | Seamstress | Pennsylvania |
| 22 | John Mcgrany | 6 | Son | — | Pennsylvania |
| 23 | John Kramer | 47 | Head | Carpenter | Hungary |
| 24 | Helen Kramer | 44 | Wife | — | Germany |
| 25 | John Kramer | 13 | Son | — | Pennsylvania |
| 26 | Leonard Kramer | 6 | Son | — | Pennsylvania |
| 27 | Caroline Quinn | 78 | Head | — | Pennsylvania |
| 28 | Edward Farlow | 47 | Head | Porter | Pennsylvania |
| 29 | Marie Farlow | 44 | Wife | — | Pennsylvania |
| 30 | Edward J. Farlow | 18 | Son | Advertising | Pennsylvania |
| 31 | George Farlow | 17 | Son | — | Pennsylvania |
| 32 | Joseph Farlow | 15 | Son | — | Pennsylvania |
| 33 | Philip Farlow | 13 | Son | — | Pennsylvania |
| 34 | Raymond Farlow | 6 | Son | — | Pennsylvania |
| 35 | George Marquart | 34 | Boarder | Helper | Pennsylvania |
| 36 | Helen Marquart | 24 | Daughter | — | Pennsylvania |
| 37 | Joan Marquart | 2 | Granddaughter | — | Pennsylvania |
| 38 | George Jr. Marquart | 0 | Grandson | — | Pennsylvania |
| 39 | Teresa De Long | 60 | Head | — | Italy |
| 40 | Anthony De Long | 30 | Son | Machinist | Pennsylvania |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)