MJ
Martha Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this Martha Johnson across the 1910, 1920, 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed), with identified parents Frank & Thomas — first a head (b.~1906), then head of a 3-person household.
Age 34
b. ~1906
Female
Head
Born: Maryland
Separated
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Johnson |
| Given Name | Martha |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | Black |
| Age | 34 |
| Marital Status | Separated |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| Additional Details | |
| Occupation | Laundry |
| Industry | PW |
| Class of Worker | 338 |
| Highest Grade | No 7 |
| 1935 Residence | 26 |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Laundry |
| 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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Martha | Age | Birth yr |
|---|---|---|---|---|
| Martha Johnson | Head | — | 34 | ~1906 |
| William Parron | Other | — | 41 | ~1899 |
| William Johnson | Son | — | 17 | ~1923 |
Census Appearances
1910
Baltimore, Maryland
Daughter, age 4
Baltimore, Maryland · implied b. ~1906 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Martha |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1920
Baltimore, Maryland
Daughter, age 13
Baltimore, Maryland · implied b. ~1907 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Martha |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | Black |
| Age | 13 |
| 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
Daughter, age 23
Baltimore, Maryland · implied b. ~1907 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Martha |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Laundress |
| Industry | Laundry |
| Class of Worker | W |
| Can Read/Write | 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 — 3 household members
| Surname | Johnson |
| Given Name | Martha |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | Black |
| Age | 34 |
| Marital Status | Separated |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| Occupation | Laundry |
| Industry | PW |
| Class of Worker | 338 |
| Highest Grade | No 7 |
| 1935 Residence | 26 |
| 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 Martha Johnson across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Frank Johnson (~0.92 confidence) and father Thomas Johnson (~0.92 confidence) and mother Virginia Johnson (~0.92 confidence) and mother Matilda Johnson (~0.92 confidence) and mother Carrie Johnson (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frank Johnson
b. ~1870
Source father
● Household
· direct · ~0.92
Father
Thomas Johnson
b. ~1873
Source father
● Household
· direct · ~0.92
Mother
Virginia Johnson
b. ~1890
Source mother
● Household
· direct · ~0.92
Mother
Matilda Johnson
b. ~1888
Source mother
● Household
· direct · ~0.92
Mother
Carrie Johnson
b. ~1872
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Martha Johnson
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-t0627-01529-00509)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Georgianna Carter | 53 | Lodger | — | Maryland |
| 2 | Clister Woods | 44 | Head | Unloading Freight | Virginia |
| 3 | Annie Woods | 33 | Wife | — | Maryland |
| 4 | Joseph Fisher | 69 | Father-in-law | — | Maryland |
| 5 | Martha Johnson THIS PERSON | 34 | Head | Laundry | Maryland |
| 6 | William Johnson | 17 | Son | — | Maryland |
| 7 | William Parron | 41 | Lodger | Butchers Market | Maryland |
| 8 | Ernest Richardson | 35 | Head | Wagon Manufacturer | South Carolina |
| 9 | Arda Richardson | 31 | Wife | Private Family | South Carolina |
| 10 | Bertha Richardson | 13 | Daughter | — | Maryland |
| 11 | Rosalee Richardson | 11 | Daughter | — | Maryland |
| 12 | James Richardson | 10 | Son | — | Maryland |
| 13 | Fredonia Richardson | 8 | Daughter | — | Maryland |
| 14 | Benhaywood Richardson | 6 | Son | — | Maryland |
| 15 | Joseph Trapp | 23 | Lodger | Killian Plumbing | South Carolina |
| 16 | Benjamin Richardson | 29 | Brother | West End Dairy | South Carolina |
| 17 | Julius Richardson | 26 | Head | Private Family | South Carolina |
| 18 | Marie Richardson | 32 | Sister | Private Family | South Carolina |
| 19 | Nancy Hilyard | 24 | Sister | Private Family | South Carolina |
| 20 | William Smith | 39 | Lodger | Pool Room | South Carolina |
| 21 | Elizabeth Richardson | 18 | Sister | — | South Carolina |
| 22 | Ruby M Richardson | 16 | Sister | — | South Carolina |
| 23 | Eddie Richardson | 22 | Brother | Farm Work | South Carolina |
| 24 | Jessie L Hilyard | 7 | Neice | — | South Carolina |
| 25 | Illenora Mims | 37 | Head | Baltimore Copper Works | South Carolina |
| 26 | Agnes Mims | 34 | Wife | — | South Carolina |
| 27 | Robert Mims | 12 | Son | — | South Carolina |
| 28 | Mary E Pearyear | 30 | Head | — | Virginia |
| 29 | John Pearyear | 13 | Son | — | Maryland |
| 30 | Virginia V Pearyear | 11 | Daughter | — | Maryland |
| 31 | James E Pearyear | 11 | Son | — | Virginia |
| 32 | Ruby E Pearyear | 9 | Daughter | — | Virginia |
| 33 | Date Gaskins | 39 | Lodger | Stanley Furniture | Virginia |
| 34 | Ethel Watts | 35 | Head | Laundry | Maryland |
| 35 | Edward Watts | 19 | Son | Stanley Furniture | Maryland |
| 36 | Walter Watts | 16 | Son | — | Maryland |
| 37 | Howard Warden | 60 | Lodger | Ship Yard | Maryland |
| 38 | Austin Simpson | 55 | Head | W. B. & A. Water Department | Maryland |
| 39 | Elizabeth Simpson | 66 | Wife | — | Maryland |
| 40 | George Simpson | 26 | Son | West Baltimore Ice Company | Maryland |
Related Census Records
Pedigree Summary
Martha
Gen 1 · 5 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)