WS
William Sullivan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this William Sullivan across the 1920, 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed), with identified parents William & William — first a son (b.~1919), then head of a 3-person household.
Age 21
b. ~1919
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Sullivan |
| Given Name | William S. (Jr) |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Hours Worked | 40 |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1919 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| William Sullivan | Head | — | 58 | ~1882 |
| William Sullivan | Son | — | 21 | ~1919 |
| Marie Sullivan | Spouse | — | 55 | ~1885 |
Census Appearances
1920
Baltimore, Maryland
Son, age 2
Baltimore, Maryland · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | none |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Son, age 11
Baltimore, Maryland · implied b. ~1919 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | William S. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Son, age 21
Baltimore-City-County, Maryland · implied b. ~1919 — 3 household members
| Surname | Sullivan |
| Given Name | William S. (Jr) |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Hours Worked | 40 |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
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 Sullivan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father William Sullivan (~0.92 confidence) and father William Sullivan (~0.92 confidence) and mother John Sullivan (~0.92 confidence) and mother Marie Sullivan (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
William Sullivan
b. ~1881
Source father
● Household
· direct · ~0.92
Father
William Sullivan
b. ~1882
Source father
● Household
· direct · ~0.92
Mother
John Sullivan
b. ~1896
Source mother
● Household
· direct · ~0.92
Mother
Marie Sullivan
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Sullivan
Son · 1940 · age 21 · b. ~1919 · Maryland
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Baltimore-City-County, Maryland
Open full size
1940 US Federal Census — Baltimore-City-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01539-00375)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Nancy E. Moran | 64 | Wife | — | Michigan |
| 2 | William D. Sullivan | 58 | Head | Attorney At Law | Maryland |
| 3 | Marie E. Sullivan | 55 | Wife | — | Maryland |
| 4 | William S. (Jr) Sullivan THIS PERSON | 21 | Son | — | Maryland |
| 5 | Louise Horner | 42 | Head | Seamstress | Maryland |
| 6 | Eleanor Esther Horner | 19 | Daughter | — | Maryland |
| 7 | Myrtle M. Cushing | 48 | Head | Manager | Maryland |
| 8 | Florence S. Mowray | 32 | Sister | Cutter | Maryland |
| 9 | William R. Johnson | 52 | Head | Car Clerk | Maryland |
| 10 | Margaret J. Johnson | 56 | Wife | — | Maryland |
| 11 | James Arnold | 55 | Head | Proprietor | Maryland |
| 12 | Madeline J. Arnold | 47 | Wife | — | Maryland |
| 13 | Madeline D. Arnold | 24 | Daughter | Asst. Instructor | Maryland |
| 14 | Charles H. Drexel | 48 | Head | Real Estate Broker | Maryland |
| 15 | Jennie D. Drexel | 43 | Wife | — | Maryland |
| 16 | Charles W. Drexel | 25 | Son | Laborer | Maryland |
| 17 | Virginia Drexel | 24 | Daughter | — | Maryland |
| 18 | Charles Aug. Drexel | 7 | Son | — | Maryland |
| 19 | John A. Leach | 72 | Head | Retired | Maryland |
| 20 | Eva M. Leach | 72 | Wife | — | Maryland |
| 21 | Ernest A. Philipp | 48 | Head | Proprietor | Maryland |
| 22 | Amanda E. Philipp | 44 | Wife | — | Maryland |
| 23 | Ernest A. Jr. Philipp | 23 | Son | Auto Mechanic | Maryland |
| 24 | George E. Philipp | 21 | Son | Clerk | Maryland |
| 25 | Robert H. Philipp | 18 | Son | Radio Repairer | Maryland |
| 26 | B. Raymond Philipp | 15 | Son | — | Maryland |
| 27 | Henry E. Philipp | 8 | Son | — | Maryland |
| 28 | Ralph W. Smallwood | 52 | Head | Sales Represent. | Pennsylvania |
| 29 | Ruth O. Smallwood | 44 | Wife | — | Maryland |
| 30 | Ralph J. Smallwood | 26 | Son | Salesman | Maryland |
| 31 | Harry B. Clifton | 54 | Head | Chiropodist | New York |
| 32 | Minnie L. Clifton | 52 | Wife | — | Maryland |
| 33 | H. Paul Clifton | 8 | Son | — | Maryland |
| 34 | Harvey G. Kramer | 56 | Head | Lead Foreman | Ohio |
| 35 | Rose M. Kramer | 64 | Wife | — | Ohio |
| 36 | Lora D. Lumley | 56 | Head | Manufac. Clerk | Maryland |
| 37 | Eleanor Lumley | 31 | Daughter | Stenographer | Maryland |
| 38 | Robert J. Eunick | 54 | Head | Proprietor | Maryland |
| 39 | Alice R. Eunick | 53 | Wife | — | Maryland |
| 40 | William Eunick | 22 | Son | Sheet Metal | Maryland |
Pedigree Summary
William
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
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)