MJ
Mary Jones — 1940 US Census Record
Model Tree available1940 United States Federal Census · Baltimore-County, Maryland
Our Model Tree links this Mary Jones across the 1910, 1920, 1930 and 1940 US Censuses in Baltimore-County, Maryland (XGBoost, ~Confirmed), with identified parents Henry & Joseph — first a spouse (b.~1901), then head of a 5-person household.
Age 39
b. ~1901
Female
Spouse
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-County, Maryland |
| Surname | Jones |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | Black |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Catonsville (pt) |
| 1935 Residence (County) | Baltimore |
| Additional Details | |
| Occupation | servant |
| Industry | private family |
| Class of Worker | PW |
| Hours Worked | 24 |
| Income (1939) | 156 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Servant |
| Township / Ward | Catonsville Pt |
| Est. Birth Year | ~1901 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| William Jones | Head | — | 40 | ~1900 |
| Sarah Johnson | Other | — | 18 | ~1922 |
| Bertha Butler | Other | — | 25 | ~1915 |
| William Jones | Son | — | 19 | ~1921 |
| Mary Jones | Spouse | — | 39 | ~1901 |
Census Appearances
1910
Baltimore, Maryland
Daughter, age 7
Baltimore, Maryland · implied b. ~1903 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jones |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | Black |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1920
Baltimore, Maryland
Daughter, age 18
Baltimore, Maryland · implied b. ~1902 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jones |
| Given Name | Mary S |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Spouse, age 29
Baltimore, Maryland · implied b. ~1901 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jones |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | Black |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 18 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Laborer |
| Industry | Truck Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-County, Maryland
Spouse, age 39
Baltimore-County, Maryland · implied b. ~1901 — 5 household members
| Surname | Jones |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | Black |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Catonsville (pt) |
| 1935 Residence (County) | Baltimore |
| Occupation | servant |
| Industry | private family |
| Class of Worker | PW |
| Hours Worked | 24 |
| Income (1939) | 156 |
| Highest Grade | No 7 |
| 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 Mary Jones across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Henry Jones (~0.92 confidence) and father Joseph Jones (~0.92 confidence) and mother Wife Jones (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Henry Jones
b. ~1880
Source father
● Household
· direct · ~0.92
Father
Joseph Jones
b. ~1872
Source father
● Household
· direct · ~0.92
Mother
Wife Jones
b. ~1869
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Jones
Spouse · 1940 · age 39 · b. ~1901 · 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-County, Maryland
Open full size
1940 US Federal Census — Baltimore-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01503-00189)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mamie @ Harris | 55 | Head | Cook | Maryland |
| 42 | Bertie Harris | 35 | Daughter | — | Maryland |
| 43 | James B. @ Donnelly | 20 | Head | Pin Boy | Maryland |
| 44 | Frank W. Talbot | 52 | Head | Houseman | Maryland |
| 45 | Mary E. Talbot | 46 | Wife | Cook | Maryland |
| 46 | Mamie @ Talbot | 21 | Daughter | — | Maryland |
| 47 | George R. Jr. Hall | 31 | Head | Porter | Maryland |
| 48 | Helen M. @ Hall | 32 | Wife | Servant | Maryland |
| 49 | Howard B. Hall | 13 | Son | — | Maryland |
| 50 | Ida M. Hall | 11 | Daughter | — | Maryland |
| 51 | Mildred A. Hall | 10 | Daughter | — | Maryland |
| 52 | Frederick D. Hall | 7 | Son | — | Maryland |
| 53 | Claudette Hall | 4 | Daughter | — | Maryland |
| 54 | Louis T. Terrell | 40 | Head | Chauffeur | Maryland |
| 55 | Rebecca @ Terrell | 35 | Wife | Cook | Maryland |
| 56 | Alice Dorsey | 82 | Mother-in-law | — | Maryland |
| 57 | Joan Terrell | 7 | Daughter | — | Maryland |
| 58 | Coursey Bentley | 28 | Lodger | High School Teacher | Maryland |
| 59 | William T. Jones | 40 | Head | Laborer | North Carolina |
| 60 | Mary Jones THIS PERSON | 39 | Wife | Servant | Maryland |
| 61 | William Jones | 19 | Son | Laborer | Maryland |
| 62 | Sarah @ Johnson | 18 | Lodger | — | Maryland |
| 63 | Bertha Butler | 25 | Lodger | Servant | Maryland |
| 64 | Ross Schisler | 54 | Head | Spindleman | Maryland |
| 65 | Catherine @ Schisler | 49 | Wife | — | Maryland |
| 66 | Bessie Taylor | 50 | Lodger | — | Maryland |
| 67 | Robert Franck | 40 | Head | Carpenter | Maryland |
| 68 | Elizabeth @ Franck | 36 | Wife | — | Maryland |
| 69 | Gloria Franck | 13 | Daughter | — | Maryland |
| 70 | Daniel Franck | 11 | Son | — | Maryland |
| 71 | August @ Mastrani | 49 | Head | Barber | Italy |
| 72 | Mary Mastrani | 41 | Wife | — | Italy |
| 73 | August Jr. Mastrani | 5 | Son | — | Maryland |
| 74 | Gino Mastrani | 52 | Brother | Laborer | Italy |
| 75 | John Stanley Gerhart | 42 | Head | Truck Driver | Maryland |
| 76 | Ruth @ Gerhart | 37 | Wife | — | Maryland |
| 77 | Stanley Gerhart | 15 | Son | — | Maryland |
| 78 | Catherine Gerhart | 12 | Daughter | — | Maryland |
| 79 | Joan Gerhart | 10 | Daughter | — | Maryland |
| 80 | Marian Gerhart | 9 | Son | — | Maryland |
Pedigree Summary
Mary
Gen 1 · 3 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)