MM
Mary Monahan — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Worcester, Massachusetts
Our Model Tree links this Mary Monahan across the 1920 and 1930 US Censuses in Worcester, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1915), then head of a 8-person household.
Age 15
b. ~1915
Female
Daughter
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Worcester, Massachusetts |
| Surname | Monahan |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Occupation | Stock Clerk |
| Industry | Wire Goods |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Stock Clerk |
| Township / Ward | Worcester City |
| Est. Birth Year | ~1915 |
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 |
|---|---|---|---|---|
| Elizabeth Monahan | Spouse | — | 45 | ~1885 |
| Clare Monahan | Daughter | — | 1 | ~1929 |
| John Monahan | Head | — | 46 | ~1884 |
| Mary Monahan | Daughter | — | 15 | ~1915 |
| Paul Monahan | Son | — | 5 | ~1925 |
| John Monahan | Son | — | 13 | ~1917 |
| Dorothy Monahan | Daughter | — | 10 | ~1920 |
| Winifred Monahan | Daughter | — | 14 | ~1916 |
Census Appearances
1920
Worcester, Massachusetts
Daughter, age 5
Worcester, Massachusetts · implied b. ~1915 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Monahan |
| Given Name | Mary C |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Worcester, Massachusetts
Daughter, age 15
Worcester, Massachusetts · implied b. ~1915 — 8 household members
| Surname | Monahan |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Stock Clerk |
| Industry | Wire Goods |
| Class of Worker | W |
| Can Read/Write | Yes |
| 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 Monahan across 2 US Census years (1920 and 1930) in Worcester, Massachusetts, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Monahan
Daughter · 1930 · age 15 · b. ~1915 · Massachusetts
★ You are viewing this record
Sibling
Paul Monahan
Sibling · 1930 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Winifred Monahan
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Clare Monahan
Sibling · 1930 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Monahan
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Monahan
Sibling · 1930 · age 13
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 — Worcester, Massachusetts
Open full size
1930 US Federal Census — Worcester, Massachusetts
Page Contents
48 people indexed on this census page (ia:1930:massachusettscensus00reel971:0348)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John P. Monroe | 38 | Head | Cook | Maine |
| 2 | Julia Monroe | 31 | Wife | — | Canada-French |
| 3 | Helen Monroe | 17 | Son | Counterman | Maine |
| 4 | Julia Monroe | 13 | Daughter | — | Massachusetts |
| 5 | Harriet Dudley | 60 | Boarder | Domestic | Irish Free State |
| 6 | Maurice Rine | 38 | Head | Mill Hand | Italy |
| 7 | Aluma Rine | 31 | Wife | — | Italy |
| 8 | Gloria Rine | 2 | Daughter | — | Massachusetts |
| 9 | Peter Hines | 33 | Head | Foreman | Irish Free State |
| 10 | Sadie T. Hines | 38 | Wife | — | Massachusetts |
| 11 | Timothy J. Hines | 9 | Daughter | — | Massachusetts |
| 12 | Robert G. Hines | 6 | Son | — | Massachusetts |
| 13 | Marion E. Hines | 4 | Daughter | — | Massachusetts |
| 14 | Fred Barton | 58 | Head | Watchman | Massachusetts |
| 15 | Laura Barton | 46 | Wife | — | Massachusetts |
| 16 | George Barton | 14 | Son | — | Connecticut |
| 17 | Eva Barton | 40 | Sister-in-law | House Work | Massachusetts |
| 18 | James Long | 59 | Head | Janitor | Irish Free State |
| 19 | Margaret H. Long | 58 | Wife | — | Irish Free State |
| 20 | Margaret Long | 28 | Daughter | Clerk | Massachusetts |
| 21 | Mary Long | 27 | Daughter | Stitcher | Massachusetts |
| 22 | Ellen Long | 18 | Daughter | Stitcher | Massachusetts |
| 23 | William Long | 15 | Son | — | Massachusetts |
| 24 | Thomas J. Monahan | 48 | Head | Superintendent | Massachusetts |
| 25 | Cecilia G. Monahan | 47 | Wife | — | Massachusetts |
| 26 | John J. Monahan | 21 | Son | — | Massachusetts |
| 27 | Thomas J. Jr. Monahan | 19 | Son | — | Massachusetts |
| 28 | Francis Monahan | 16 | Son | — | Massachusetts |
| 29 | Harold Monahan | 14 | Son | — | Massachusetts |
| 30 | Fred H. Damarell | 51 | Head | Mechanic | Canada-English |
| 31 | Edna Damarell | 49 | Wife | — | Maine |
| 32 | Marion Damarell | 27 | Daughter | Bookkeeper | Massachusetts |
| 33 | Marjorie Damarell | 20 | Daughter | Cashier | Massachusetts |
| 34 | Mary E. Boyla | 66 | Head | — | Connecticut |
| 35 | Anna E. Boyla | 34 | Niece | Press Hand | Massachusetts |
| 36 | Frederick T. Boyla | 32 | Nephew | Laborer | Massachusetts |
| 37 | Francis J. Boyla | 30 | Nephew | Creaser | Massachusetts |
| 38 | Daniel G. Boyla | 27 | Nephew | Clerk | Massachusetts |
| 39 | Katherine M. Boyla | 26 | Niece | Laundress | Massachusetts |
| 40 | Grace C. Hanley | 34 | Boarder | Servant | New York |
| 41 | John J. Monahan | 46 | Head | — | Massachusetts |
| 42 | Elizabeth A. Monahan | 45 | Wife | — | Massachusetts |
| 43 | Mary E. Monahan THIS PERSON | 15 | Daughter | Stock Clerk | Massachusetts |
| 44 | Winifred A. Monahan | 14 | Daughter | — | Massachusetts |
| 45 | John H. Monahan | 13 | Son | — | Massachusetts |
| 46 | Dorothy M. Monahan | 10 | Daughter | — | Massachusetts |
| 47 | Paul E. Monahan | 5 | Son | — | Massachusetts |
| 48 | Clare E. Monahan | 1 | Daughter | — | Massachusetts |
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)