MJ
Mary Jennings — 1930 US Census Record
Model Tree available1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this Mary Jennings across the 1920, 1930 and 1940 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed), with identified parents Frank & Mary — first a daughter (b.~1913), then head of a 4-person household.
Age 17
b. ~1913
Female
Daughter
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | Jennings |
| Given Name | Mary Estella |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Medford City |
| Est. Birth Year | ~1913 |
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.
4 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Helen Jennings | Daughter | — | 19 | ~1911 |
| Mary Jennings | Daughter | — | 17 | ~1913 |
| Frank Jennings | Head | — | 48 | ~1882 |
| Mary Jennings | Other | — | 48 | ~1882 |
Census Appearances
1920
Middlesex, Massachusetts
Daughter, age 7
Middlesex, Massachusetts · implied b. ~1913 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jennings |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Daughter, age 17
Middlesex, Massachusetts · implied b. ~1913 — 4 household members
| Surname | Jennings |
| Given Name | Mary Estella |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Spouse, age 28
Middlesex-County, Massachusetts · implied b. ~1912 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jennings |
| Given Name | Margaret C. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Roxbury, Suff. Co. |
| Industry | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 Jennings across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Frank Jennings (~0.92 confidence) and mother Mary Jennings (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frank Jennings
b. ~1882
Source father
● Household
· direct · ~0.92
Mother
Mary Jennings
b. ~1882
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Jennings
Daughter · 1930 · age 17 · b. ~1913 · Massachusetts
★ You are viewing this record
Sibling
Helen Jennings
Sibling · 1930 · age 19
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 — Middlesex, Massachusetts
Open full size
1930 US Federal Census — Middlesex, Massachusetts
Page Contents
50 people indexed on this census page (ia:1930:massachusettscensus00reel924:0884)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | August Peterson | 69 | Father | Assistant Shipper | Sweden |
| 52 | Ella Peterson | 69 | Mother | — | Sweden |
| 53 | B. A. Evelyn | 30 | Sister | Clerk State House Office | Massachusetts |
| 54 | Oscar S. Jeffrey | 56 | Head | Carpenter | Nova Scotia |
| 55 | Estella Jeffrey | 53 | Wife-H | — | Nova Scotia |
| 56 | Lois C. Purves | 27 | Daughter | Machine Operator | Nova Scotia |
| 57 | Lester S. Jeffrey | 21 | Son | Pressman | Nova Scotia |
| 58 | Russell M. Jeffrey | 20 | Son | Laborer | Nova Scotia |
| 59 | Doris M. Jeffrey | 18 | Daughter | Shaker | Massachusetts |
| 60 | Stanley L. Jeffrey | 11 | Son | — | Massachusetts |
| 61 | Catherine S. Purves | 8 | Grand Daughter | — | Massachusetts |
| 62 | Lloyd E. Wood | 31 | Head | Auto Salesman | New Brunswick |
| 63 | Rhoda A. Wood | 31 | Wife-H | — | New Brunswick |
| 64 | Osman Coulter | 24 | Boarder | Driver | New Brunswick |
| 65 | Percival A. Giles | 23 | Boarder | Driver | Nova Scotia |
| 66 | Eric J. Magnuson | 40 | Head | Baker | Sweden |
| 67 | Jennie V. Magnuson | 37 | Wife-H | — | Massachusetts |
| 68 | Eric E. Magnuson | 12 | Son | — | Massachusetts |
| 69 | Arthur E. Nelson | 30 | Brother in law | Pressman | Sweden |
| 70 | Lillian E. Nelson | 25 | Sister in law | Stenographer | Sweden |
| 71 | Peter P. Brennan | 61 | Head | Foreman (Rubber) | England |
| 72 | Catherine A. Brennan | 66 | Wife-H | — | Irish Free State |
| 73 | Ernest C. Nicholson | 43 | Head | Mechanic | England |
| 74 | Anna J. Nicholson | 43 | Wife-H | — | Irish Free State |
| 75 | Margaret R. Nicholson | 14 | Daughter | — | Massachusetts |
| 76 | Mary E. Nicholson | 13 | Daughter | — | Massachusetts |
| 77 | Kathleen W. Nicholson | 10 | Daughter | — | Massachusetts |
| 78 | Edward B. Nicholson | 8 | Son | — | Massachusetts |
| 79 | Winthrop S. Horton | 53 | Head | Salesman | Massachusetts |
| 80 | Harriet W. Horton | 41 | Wife-H | — | Massachusetts |
| 81 | Robert S. Horton | 11 | Son | — | Massachusetts |
| 82 | Frank E. Jennings | 48 | Head | Assistant Manager | Massachusetts |
| 83 | Mary V. Jennings | 48 | Wife-H | — | Massachusetts |
| 84 | Helen V. Jennings | 19 | Daughter | Sales Lady | Massachusetts |
| 85 | Mary Estella Jennings THIS PERSON | 17 | Daughter | — | Massachusetts |
| 86 | Roland D. Smith | 32 | Head | Salesman | Massachusetts |
| 87 | Ellen B. Smith | 32 | Wife-H | — | Massachusetts |
| 88 | Beatrice Smith | 11 | Daughter | — | Massachusetts |
| 89 | Geraldine W. Smith | 10 | Daughter | — | Massachusetts |
| 90 | Richard J. Smith | 9 | Son | — | Massachusetts |
| 91 | Harry B. Smith | 6 | Son | — | Massachusetts |
| 92 | John E. Smith | 1 | Son | — | Massachusetts |
| 93 | Myron E. Curtis | 58 | Head | Carpenter | Massachusetts |
| 94 | Doris W. Curtis | 19 | Daughter | — | Massachusetts |
| 95 | Edward J. Hamilton | 42 | Head | Machinist | Massachusetts |
| 96 | Sarah A. Hamilton | 36 | Wife-H | — | Sweden |
| 97 | Edward J. Hamilton | 14 | Son | — | Massachusetts |
| 98 | Charles E. Mahoney | 57 | Head | Carpenter | New Hampshire |
| 99 | Myra E. Mahoney | 50 | Wife-H | — | Massachusetts |
| 100 | Ellen E. Mahoney | 84 | Mother | — | Massachusetts |
Pedigree Summary
Mary + 1 sibling
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 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)