JB
John Blake — 1940 US Census Record
Model Tree available1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this John Blake across the 1920, 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed), with identified parents Thomas & Alice — first a head (b.~1906), then head of a 7-person household.
Age 34
b. ~1906
Male
Head
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Blake |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Occupation | Porter |
| Industry | Baking Co |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 750 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Porter |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1906 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Forrest Blake | Son | — | 3 | ~1937 |
| Alvin Blake | Son | — | 2 | ~1938 |
| Thomas Blake | Son | — | 5 | ~1935 |
| John Blake | Son | — | 10 | ~1930 |
| John Blake | Head | — | 34 | ~1906 |
| Margaret Blake | Spouse | — | 35 | ~1905 |
| Evelyn Blake | Daughter | — | 4 | ~1936 |
Census Appearances
1920
X, Maryland
Son, age 13
X, Maryland · implied b. ~1907 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blake |
| Given Name | John R. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Virginia |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
None, Maryland
Son, age 24
None, Maryland · implied b. ~1906 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blake |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 24 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 23 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Virginia |
| Occupation | Laborer |
| Industry | Bakery |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Veteran | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Head, age 34
Baltimore-City-County, Maryland · implied b. ~1906 — 7 household members
| Surname | Blake |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Occupation | Porter |
| Industry | Baking Co |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 750 |
| Highest Grade | Hs 2 |
| 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 Blake across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage. Identified parents: father Thomas Blake (~0.92 confidence) and mother Alice Blake (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Thomas Blake
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Alice Blake
b. ~1883
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Blake
Head · 1940 · age 34 · b. ~1906 · 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-t0627-01531-00155)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Edward A. Whittington | 39 | Head | Cooker | Maryland |
| 2 | Harriet H. Whittington | 37 | Wife | — | Maryland |
| 3 | Willie Whittington | 19 | Daughter | — | Maryland |
| 4 | Mabel Whittington | 17 | Daughter | House Worker | Maryland |
| 5 | Walter Whittington | 15 | Son | — | Maryland |
| 6 | Catherine Whittington | 13 | Daughter | — | Maryland |
| 7 | Shirley Whittington | 4 | Daughter | — | Maryland |
| 8 | Howard Whittington | 2 | Son | — | Maryland |
| 9 | Jerome Whittington | 0 | Son | — | Maryland |
| 10 | Doris Crosby | 0 | Granddaughter | — | Maryland |
| 11 | James Correll | 32 | Head | — | Maryland |
| 12 | Martha Correll | 38 | Wife | — | Maryland |
| 13 | George Correll | 12 | Son | — | Maryland |
| 14 | Willie Smith | 46 | Head | Laborer | Maryland |
| 15 | Anna Smith | 46 | Wife | House Work | Maryland |
| 16 | Jennie Smith | 33 | Daughter | — | Maryland |
| 17 | Clara Smith | 32 | Daughter | — | Maryland |
| 18 | William Smith | 31 | Son | Truck Driver | Maryland |
| 19 | Raymond Smith | 16 | Son | — | Maryland |
| 20 | Clara Smith | 14 | Daughter | — | Maryland |
| 21 | Virginia Smith | 12 | Daughter | — | Maryland |
| 22 | Viola Smith | 11 | Daughter | — | Maryland |
| 23 | Rachel Smith | 8 | Daughter | — | Maryland |
| 24 | John Blake THIS PERSON | 34 | Head | Porter | Maryland |
| 25 | Margaret Blake | 35 | Wife | — | Maryland |
| 26 | John Blake | 10 | Son | — | Maryland |
| 27 | Thomas Blake | 5 | Son | — | Maryland |
| 28 | Evelyn Blake | 4 | Daughter | — | Maryland |
| 29 | Forrest Blake | 3 | Son | — | Maryland |
| 30 | Alvin Blake | 2 | Son | — | Maryland |
| 31 | William Hood | 36 | Head | Copper Flapper | Georgia |
| 32 | Ruth Hood | 32 | Wife | — | Pennsylvania |
| 33 | Welton Hood | 18 | Son | General | Pennsylvania |
| 34 | John Marshall | 32 | Head | Porter | Maryland |
| 35 | Annie Marshall | 30 | Wife | — | Maryland |
| 36 | Frank Marshall | 10 | Son | — | Maryland |
| 37 | Sarah Carr | 61 | Head | — | Maryland |
| 38 | Clarence Carr | 42 | Son | Truck Driver | Maryland |
| 39 | Pearl Carr | 38 | Daughter | Cook | Maryland |
| 40 | Clarence Carr | 16 | Grandson | — | 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)