MD
Mary Donnelly — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Mercer, Pennsylvania
Our Model Tree links this Mary Donnelly across the 1920 and 1930 US Censuses in Mercer, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1912), then head of a 11-person household.
Age 18
b. ~1912
Female
Daughter
Born: Pennsylvania
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Mercer, Pennsylvania |
| Surname | Donnelly |
| Given Name | Mary L |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Scotland |
| Additional Details | |
| Occupation | Stenographer |
| Industry | P O W Works |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Stenographer |
| Township / Ward | Sharon City |
| Est. Birth Year | ~1912 |
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.
11 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Donnelly | Daughter | — | 18 | ~1912 |
| Dorothy Donnelly | Daughter | — | 1 | ~1929 |
| Adell Donnelly | Daughter | — | 9 | ~1921 |
| Helen Donnelly | Daughter | — | 7 | ~1923 |
| William Donnelly | Head | — | 43 | ~1887 |
| Joseph Donnelly | Son | — | 3 | ~1927 |
| Edward Donnelly | Son | — | 13 | ~1917 |
| Frank Donnelly | Son | — | 11 | ~1919 |
| William Donnelly | Son | — | 19 | ~1911 |
| Robert Donnelly | Son | — | 16 | ~1914 |
| Helen Donnelly | Spouse | — | 41 | ~1889 |
Census Appearances
1920
Mercer, Pennsylvania
Daughter, age 8
Mercer, Pennsylvania · implied b. ~1912 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Donnelly |
| Given Name | Mary L |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Scotland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Mercer, Pennsylvania
Daughter, age 18
Mercer, Pennsylvania · implied b. ~1912 — 11 household members
| Surname | Donnelly |
| Given Name | Mary L |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Scotland |
| Occupation | Stenographer |
| Industry | P O W Works |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 Donnelly across 2 US Census years (1920 and 1930) in Mercer, Pennsylvania, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Donnelly
Daughter · 1930 · age 18 · b. ~1912 · Pennsylvania
★ You are viewing this record
Sibling
Dorothy Donnelly
Sibling · 1930 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Donnelly
Sibling · 1930 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Donnelly
Sibling · 1930 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Donnelly
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Adell Donnelly
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Donnelly
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Donnelly
Sibling · 1930 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Donnelly
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 — Mercer, Pennsylvania
Open full size
1930 US Federal Census — Mercer, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1930:fifteenthcensus00reel2077:0765)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Bertha M Comstock | 10 | Son | — | Ohio |
| 52 | Nettie M Booth | 69 | Mother-in-law | — | Ohio |
| 53 | Custis E Keen | 46 | Head | Engineer | Kansas |
| 54 | Tilora Keen | 44 | Wife | — | Kansas |
| 55 | Mary V Keen | 9 | Daughter | — | Pennsylvania |
| 56 | Frank Anderson | 29 | Head | Railroader | Indiana |
| 57 | Anne Anderson | 26 | Wife | — | North Dakota |
| 58 | Robert Anderson | 3 | Son | — | Indiana |
| 59 | Louis Keiser | 65 | Head | Laborer | Pennsylvania |
| 60 | Eva H Keiser | 60 | Wife | — | Pennsylvania |
| 61 | Norman Keiser | 19 | Son | Messenger Boy | Pennsylvania |
| 62 | Dorothy Keiser | 23 | Daughter | Teacher | Pennsylvania |
| 63 | Albert Thompson | 32 | Head | Mechanic | Pennsylvania |
| 64 | Carrie Thompson | 28 | Wife | — | Pennsylvania |
| 65 | James A Thompson | 73 | Father | — | Pennsylvania |
| 66 | James Presley | 49 | Head | Machinist | Pennsylvania |
| 67 | Julia Presley | 45 | Wife | — | Pennsylvania |
| 68 | James E Presley | 6 | Son | — | Pennsylvania |
| 69 | Elmer Austin | 43 | Head | Machinist | Ohio |
| 70 | Irene Austin | 40 | Wife | — | Pennsylvania |
| 71 | Robert Barnes | 29 | Head | Mill Worker | West Virginia |
| 72 | Hilda Barnes | 29 | Wife | — | Pennsylvania |
| 73 | Mildred Barnes | 8 | Daughter | — | Pennsylvania |
| 74 | Robert J Barnes | 5 | Son | — | Pennsylvania |
| 75 | Mary Harris | 79 | Head | — | Ireland |
| 76 | Margaret Harris | 45 | Daughter | Dress Maker | Pennsylvania |
| 77 | Margaret Foley | 11 | Niece | — | New York |
| 78 | Charles Weaver | 25 | Head | Pressman | Ohio |
| 79 | Mary Weaver | 22 | Wife | — | Maryland |
| 80 | Mary Weaver | 4 | Daughter | — | Maryland |
| 81 | Edward Weaver | 3 | Son | — | Maryland |
| 82 | Dallas Weaver | 1 | Son | — | Maryland |
| 83 | William Donnelly | 43 | Head | Barber | Pennsylvania |
| 84 | Helen Donnelly | 41 | Wife | — | Scotland |
| 85 | William Donnelly | 19 | Son | Clerk | Pennsylvania |
| 86 | Mary L Donnelly THIS PERSON | 18 | Daughter | Stenographer | Pennsylvania |
| 87 | Robert J Donnelly | 16 | Son | — | Pennsylvania |
| 88 | Edward Donnelly | 13 | Son | — | Pennsylvania |
| 89 | Frank Donnelly | 11 | Son | — | Pennsylvania |
| 90 | Adell Donnelly | 9 | Daughter | — | Pennsylvania |
| 91 | Helen Donnelly | 7 | Daughter | — | Pennsylvania |
| 92 | Joseph Donnelly | 3 | Son | — | Pennsylvania |
| 93 | Dorothy C Donnelly | 1 | Daughter | — | Pennsylvania |
| 94 | Geo Williams | 47 | Head | Engineer | Pennsylvania |
| 95 | Gertrude Williams | 42 | Wife | — | Pennsylvania |
| 96 | Jack Williams | 17 | Son | Clerk | Pennsylvania |
| 97 | Gertrude Jr Williams | 13 | Daughter | — | Pennsylvania |
| 98 | F. L. Rummel | 69 | Head | Metal Worker | Pennsylvania |
| 99 | Alice Rummel | 68 | Wife | — | Pennsylvania |
| 100 | Thomas Motherspaw | 66 | Head | — | Scotland |
Related Census Records
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)