JK
John Kirby — 1940 US Census Record
Model Tree available1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this John Kirby across the 1920, 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed), with identified parents Joseph & Margaret — first a head (b.~1904), then head of a 3-person household.
Age 36
b. ~1904
Male
Head
Born: Maryland
Divorced
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Kirby |
| Given Name | John R |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Divorced |
| Birthplace | Maryland |
| 1935 Residence (City) | BALTIMORE CITY |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Occupation | Electric-Type Molder |
| Industry | Printing |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 1100 |
| Highest Grade | No 8 |
| 1935 Residence | Same Place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Electric-Type Molder |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1904 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| John Warner | Other | — | 45 | ~1895 |
| John Kirby | Head | — | 36 | ~1904 |
| Raymond Kirby | Son | — | 15 | ~1925 |
Census Appearances
1920
Baltimore, Maryland
Son, age 10
Baltimore, Maryland · implied b. ~1910 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kirby |
| Given Name | John L |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Son, age 21
Baltimore, Maryland · implied b. ~1909 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kirby |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Maryland |
| Age at First Marriage | 21 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Electrician |
| Industry | Ships |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Head, age 36
Baltimore-City-County, Maryland · implied b. ~1904 — 3 household members
| Surname | Kirby |
| Given Name | John R |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Divorced |
| Birthplace | Maryland |
| 1935 Residence (City) | BALTIMORE CITY |
| 1935 Residence (County) | Baltimore City |
| Occupation | Electric-Type Molder |
| Industry | Printing |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 1100 |
| Highest Grade | No 8 |
| 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 John Kirby across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Joseph Kirby (~0.92 confidence) and mother Margaret Kirby (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Joseph Kirby
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Margaret Kirby
b. ~1879
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Kirby
Head · 1940 · age 36 · b. ~1904 · 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
39 people indexed on this census page (nara:1940:m-t0627-01535-00261)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Robinson | 60 | Head | Tool Maker | Virginia |
| 2 | Susie Robinson | 56 | Wife | — | Virginia |
| 3 | John A Robinson | 18 | Son | — | Virginia |
| 4 | John J Cowig | 67 | Head | — | Virginia |
| 5 | Margaret Cowig | 72 | Wife | — | Virginia |
| 6 | Eva Lipner | 59 | Head | — | Russia |
| 7 | Joseph Lipner | 34 | Son | Counter Clerk | Russia |
| 8 | Samuel Lipner | 32 | Son | Clerk | Maryland |
| 9 | Carrie Henry | 51 | Head | — | Maryland |
| 10 | Clarence Henry | 31 | Son | Ship Caulker | Maryland |
| 11 | Lawrence Winan | 21 | Head | Clerical Work | Maryland |
| 12 | Margaret Winan | 28 | Wife | — | Maryland |
| 13 | John Apostolos | 42 | Head | Chef-Rest. | Greece |
| 14 | Bessie Apostolos | 33 | Wife | — | Greece |
| 15 | Peter Apostolos | 15 | Son | — | Maryland |
| 16 | Louis Apostolos | 14 | Son | — | Maryland |
| 17 | George Eisel | 65 | Head | Scissor-Grinder | Maryland |
| 18 | Margaret Eisel | 65 | Wife | — | Maryland |
| 19 | James D Wingate | 19 | Head | Monotype Helper | Maryland |
| 20 | Norma M Wingate | 18 | Wife | — | Maryland |
| 21 | Elizabeth Beaver | 20 | Head | Waitress | Maryland |
| 22 | Mary Kirby | 51 | Head | — | Maryland |
| 23 | Howard L Kirby | 18 | Grand-son | Apprentice Printer | Maryland |
| 24 | Myrtle B Boyce | 46 | Boarder | — | Maryland |
| 25 | John R Kirby THIS PERSON | 36 | Head | Electric-Type Molder | Maryland |
| 26 | Raymond J Kirby | 15 | Son | Stock-Clerk | Maryland |
| 27 | John H Warner | 45 | Boarder | Night Watchman | Maryland |
| 28 | Charles P Rohrer | 42 | Head | Caretaker | Maryland |
| 29 | Minnie Stevens | 67 | Mother | — | Maryland |
| 30 | James Stevens | 77 | Father | Coin-Counter | Maryland |
| 31 | Salvatore Navarro | 53 | Head | — | Cuba |
| 32 | Mildred Navarro | 47 | Wife | — | Maryland |
| 33 | Alonzo Tyler | 57 | Head | Stevedore | Georgia |
| 34 | Mary Tyler | 38 | Wife | Labor Woman | South Carolina |
| 35 | Walter Keys | 66 | Boarder | — | Maryland |
| 36 | Thomas Fitzgibbons | 41 | Head | Housepainter | Maryland |
| 37 | Mary Fitzgibbons | 46 | Wife | — | Maryland |
| 38 | Brother Fitzgibbons | 18 | Son | Shipping Clerk | Maryland |
| 39 | William Fitzgibbons | 16 | Son | — | Maryland |
Pedigree Summary
John
Gen 1 · 2 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)