WM
William Martin — 1940 US Census Record
Model Tree available1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this William Martin across the 1920, 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed), with identified parents Michael & Casper — first a son (b.~1919), then head of a 5-person household.
Age 21
b. ~1919
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Martin |
| Given Name | William S |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Occupation | Crane Knocker |
| Industry | Ship Yard |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | H 4 |
| 1935 Residence | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Crane Knocker |
| 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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Dorothy Martin | Daughter | — | 17 | ~1923 |
| Charles Martin | Head | — | 51 | ~1889 |
| Rhea Gauthier | Other | — | 42 | ~1898 |
| William Martin | Son | — | 21 | ~1919 |
| Richard Martin | Son | — | 15 | ~1925 |
Census Appearances
1920
Baltimore, Maryland
Son, age
Baltimore, Maryland · implied b. ~1920 — 14 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Martin |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Son, age 11
Baltimore, Maryland · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Martin |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | none |
| 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 — 5 household members
| Surname | Martin |
| Given Name | William S |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore |
| 1935 Residence (County) | Baltimore City |
| Occupation | Crane Knocker |
| Industry | Ship Yard |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | H 4 |
| 1935 Residence | Maryland |
| 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 Martin across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Michael Martin (~0.92 confidence) and father Casper Martin (~0.92 confidence) and father Charles Martin (~0.92 confidence) and mother Annie Martin (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Michael Martin
b. ~1887
Source father
● Household
· direct · ~0.92
Father
Casper Martin
b. ~1894
Source father
● Household
· direct · ~0.92
Father
Charles Martin
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Annie Martin
b. ~1887
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Martin
Son · 1940 · age 21 · b. ~1919 · Maryland
★ You are viewing this record
Sibling
Richard Martin
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Martin
Sibling · 1940 · age 17
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 — 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-t0627-01538-00792)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John C Spangler | 27 | Head | Stationary Engineer | Maryland |
| 2 | Mary Spangler | 31 | Wife | — | Maryland |
| 3 | Mary Ann Spangler | 2 | Daughter | — | Maryland |
| 4 | Charles R Martin | 51 | Head | Meat Cutter | Maryland |
| 5 | Dorothy J Martin | 17 | Daughter | Saleslady | Maryland |
| 6 | William S Martin THIS PERSON | 21 | Son | Crane Knocker | Maryland |
| 7 | Richard C Martin | 15 | Son | — | Maryland |
| 8 | Rhea Gauthier | 42 | Keeper | House Keeper | Richmond, Va |
| 9 | Rosario Pillari | 52 | Head | Presser | Italy |
| 10 | Vincenzina Pillari | 49 | Wife | — | Italy |
| 11 | Howard R Flint | 31 | Head | Clerk | Illinois |
| 12 | Bertha Flint | 25 | Wife | — | Kansas |
| 13 | Mary G Flint | 0 | Daughter | — | Maryland |
| 14 | Geraldo Balbo | 51 | Head | Carpenter | Italy |
| 15 | Josephine Balbo | 51 | Wife | — | Italy |
| 16 | Stella Balbo | 23 | Son | Polisher | Maryland |
| 17 | George H Forrest | 47 | Head | Laborer | Maryland |
| 18 | Francis Forrest | 43 | Wife | — | Maryland |
| 19 | George L Forrest | 19 | Son | Helper | Maryland |
| 20 | Charles W Forrest | 15 | Son | — | Maryland |
| 21 | Pete Castagna | 59 | Head | Tailor | Italy |
| 22 | Frances Castagna | 59 | Wife | — | Italy |
| 23 | Michula Gargiulo | 69 | Mother in Law | — | Italy |
| 24 | Frank Gargiulo | 43 | Head | Cementer | Italy |
| 25 | Louisa Gargiulo | 40 | Wife | — | Italy |
| 26 | Margaret Gargiulo | 18 | Daughter | — | Maryland |
| 27 | Joseph Gargiulo | 19 | Son | Apprentice | Maryland |
| 28 | John Gargiulo | 16 | Son | — | Maryland |
| 29 | Mary Gargiulo | 14 | Daughter | — | Maryland |
| 30 | Anthony Gargiulo | 11 | Son | — | Maryland |
| 31 | Vincent Gargiulo | 10 | Son | — | Maryland |
| 32 | John Gargiulo | 42 | Head | Cabinet Maker | Italy |
| 33 | Rose Gargiulo | 37 | Wife | — | Maryland |
| 34 | Rose Gargiulo | 14 | Daughter | — | Maryland |
| 35 | Margarette Gargiulo | 4 | Daughter | — | Maryland |
| 36 | Anthony Gargiulo | 39 | Head | Presser | Italy |
| 37 | Elsie Gargiulo | 39 | Wife | Seamstress | Maryland |
| 38 | Margarette Gargiulo | 13 | Daughter | — | Maryland |
| 39 | Caroline Dardozza | 73 | Head | — | Italy |
| 40 | Alvara Dardozza | 29 | Son | Tailor | Italy |
Related Census Records
Pedigree Summary
William + 2 siblings
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)