MC
Mary Carroll — 1930 US Census Record
Model Tree available1930 United States Federal Census · Baltimore, Maryland
Our Model Tree links this Mary Carroll across the 1920, 1930 and 1940 US Censuses in Baltimore, Maryland (XGBoost, ~Confirmed), with identified parents Patrick & Agnes — first a daughter (b.~1914), then head of a 8-person household.
Age 16
b. ~1914
Female
Daughter
Born: Maryland
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Baltimore, Maryland |
| Surname | Carroll |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1914 |
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.
8 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Florence Carroll | Daughter | — | 11 | ~1919 |
| Mary Carroll | Daughter | — | 16 | ~1914 |
| Joseph Carroll | Head | — | 44 | ~1886 |
| Robert Carroll | Son | — | 4 | ~1926 |
| John Carroll | Son | — | 14 | ~1916 |
| William Carroll | Son | — | 9 | ~1921 |
| Joseph Carroll | Son | — | 18 | ~1912 |
| Florence Carroll | Spouse | — | 41 | ~1889 |
Census Appearances
1920
Baltimore, Maryland
Daughter, age 5
Baltimore, Maryland · implied b. ~1915 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carroll |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Daughter, age 16
Baltimore, Maryland · implied b. ~1914 — 8 household members
| Surname | Carroll |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Other, age 26
Baltimore-City-County, Maryland · implied b. ~1914 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | CARROLL |
| Given Name | MARGARET |
| Relationship to Head | granddaughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Occupation | stenographer |
| Industry | life insurance co |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 900 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| 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 Carroll across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Patrick Carroll (~0.92 confidence) and mother Agnes Carroll (~0.92 confidence) and father Joseph Carroll (~0.92 confidence) and mother Florence Carroll (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Patrick Carroll
b. ~1880
Source father
● Household
· direct · ~0.92
Mother
Agnes Carroll
b. ~1883
Source mother
● Household
· direct · ~0.92
Father
Joseph Carroll
b. ~1886
Source father
● Household
· direct · ~0.92
Mother
Florence Carroll
b. ~1889
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Carroll
Daughter · 1930 · age 16 · b. ~1914 · Maryland
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Sibling
Robert Carroll
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Carroll
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Carroll
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Carroll
Sibling · 1930 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Florence Carroll
Sibling · 1930 · age 11
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
1930 US Federal Census — Baltimore, Maryland
Open full size
1930 US Federal Census — Baltimore, Maryland
Page Contents
30 people indexed on this census page (ia:1930:15thcensus861unit:0604)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Joseph L Carroll | 44 | Head | Proprietor | Maryland |
| 2 | Florence M Carroll | 41 | Wife | — | Maryland |
| 3 | Joseph L Jr Carroll | 18 | Son | — | Maryland |
| 4 | Mary E Carroll THIS PERSON | 16 | Daughter | — | Maryland |
| 5 | John J Carroll | 14 | Son | — | Maryland |
| 6 | Florence M Carroll | 11 | Daughter | — | Maryland |
| 7 | William J Carroll | 9 | Son | — | Maryland |
| 8 | Robert E Carroll | 4 | Son | — | Maryland |
| 9 | John Kopp | 51 | Head | Laborer | Maryland |
| 10 | Mary Kopp | 50 | Wife | — | Maryland |
| 11 | John Jr Kopp | 21 | Son | Laborer | Maryland |
| 12 | William Kopp | 19 | Son | Laborer | Maryland |
| 13 | George Kopp | 17 | Son | Laborer | Maryland |
| 14 | Charles Kopp | 15 | Son | — | Maryland |
| 15 | Mary Kopp | 13 | Daughter | — | Maryland |
| 16 | Catherine Kopp | 10 | Daughter | — | Maryland |
| 17 | Margaret Kopp | 8 | Daughter | — | Maryland |
| 18 | Robert Kopp | 4 | Son | — | Maryland |
| 19 | James Kopp | 1 | Son | — | Maryland |
| 20 | Helen Kopp | 11 | Daughter | — | Maryland |
| 21 | John Kopp | 21 | Head | Laborer | Germany |
| 22 | Anna Kopp | 21 | Wife | — | Maryland |
| 23 | John Jr Kopp | 1 | Son | — | Maryland |
| 24 | Mary Kopp | 1 | Daughter | — | Maryland |
| 25 | William Kopp | 1 | Son | — | Maryland |
| 26 | George Kopp | 1 | Son | — | Maryland |
| 27 | Charles Kopp | 1 | Son | — | Maryland |
| 28 | Robert Kopp | 4 | Son | — | Maryland |
| 29 | James Kopp | 1 | Son | — | Maryland |
| 30 | Helen Kopp | 11 | Daughter | — | Maryland |
Pedigree Summary
Mary + 5 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 1930 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)