MC
Mary Callahan — 1930 US Census Record
Linked across censuses1930 United States Federal Census · New Castle, Delaware
Our Model Tree links this Mary Callahan across the 1920 and 1930 US Censuses in New Castle, Delaware (XGBoost, ~Confirmed) — first a daughter (b.~1912), then head of a 10-person household.
Age 18
b. ~1912
Female
Daughter
Born: Delaware
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | New Castle, Delaware |
| Surname | Callahan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Delaware |
| Father's Birthplace | Delaware |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | Servant |
| Industry | Private Family |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
| Occupation | Servant |
| Township / Ward | Wilmington 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.
10 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Margaret Callahan | Daughter | — | 16 | ~1914 |
| Helen Callahan | Daughter | — | 10 | ~1920 |
| Mary Callahan | Daughter | — | 18 | ~1912 |
| Edward Callahan | Head | — | 50 | ~1880 |
| Rose Callahan | Other | — | 43 | ~1887 |
| William Callahan | Son | — | 9 | ~1921 |
| Thomas Callahan | Son | — | 14 | ~1916 |
| Edward Callahan | Son | — | 14 | ~1916 |
| Paul Callahan | Son | — | 12 | ~1918 |
| John Callahan | Son | — | 15 | ~1915 |
Census Appearances
1920
New Castle, …
Daughter, age 6
New Castle, Delaware · implied b. ~1914 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Delaware |
| Father's Birthplace | Delaware |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Irish |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
1930
New Castle, …
Daughter, age 18
New Castle, Delaware · implied b. ~1912 — 10 household members
| Surname | Callahan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Delaware |
| Father's Birthplace | Delaware |
| Mother's Birthplace | Ireland |
| Occupation | Servant |
| Industry | Private Family |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
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 Callahan across 2 US Census years (1920 and 1930) in New Castle, Delaware, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Callahan
Daughter · 1930 · age 18 · b. ~1912 · Delaware
★ You are viewing this record
Sibling
William Callahan
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Callahan
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Callahan
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Callahan
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Callahan
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Callahan
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Callahan
Sibling · 1930 · age 10
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 — New Castle, Delaware
Open full size
1930 US Federal Census — New Castle, Delaware
Page Contents
45 people indexed on this census page (ia:1930:15thcensus289unit:1085)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary Glembiowski | 40 | Wife-H | — | Delaware |
| 2 | Anthony Glembiowski | 18 | Son | — | Delaware |
| 3 | George H. Flemming | 74 | Head | Watchman | Delaware |
| 4 | Lillie Flemming | 55 | Wife-H | — | Delaware |
| 5 | Ethel Flemming | 22 | Daughter | Stenographer | Delaware |
| 6 | John Baggykowski | 45 | Head | Machinist | Poland |
| 7 | Anna Baggykowski | 40 | Wife-H | — | Delaware |
| 8 | George Baggykowski | 17 | Son | Laborer | Delaware |
| 9 | John Baggykowski | 13 | Son | — | Delaware |
| 10 | Thomas Baggykowski | 4 | Son | — | Delaware |
| 11 | Anna Baggykowski | 2 | Daughter | — | Delaware |
| 12 | Andrew Kinske | 42 | Head | Laborer | Poland |
| 13 | Frances Kinske | 39 | Wife-H | — | Poland |
| 14 | Blanche Kinske | 17 | Daughter | Trimmer | New Jersey |
| 15 | John Kinske | 15 | Son | — | New Jersey |
| 16 | Jessie Kinske | 11 | Daughter | — | New Jersey |
| 17 | Rose Kinske | 9 | Daughter | — | New Jersey |
| 18 | Bertha Kinske | 20 | Boarder | Machine Hand | Poland |
| 19 | Edward Callahan | 50 | Head | Watchman | Delaware |
| 20 | Rose Callahan | 43 | Wife-H | — | Ireland |
| 21 | John Callahan | 15 | Son | — | Delaware |
| 22 | Thomas Callahan | 14 | Son | — | Delaware |
| 23 | Paul Callahan | 12 | Son | — | Delaware |
| 24 | Helen Callahan | 10 | Daughter | — | Delaware |
| 25 | Margaret Callahan | 16 | Daughter | Salesgirl | Delaware |
| 26 | Mary Callahan THIS PERSON | 18 | Daughter | Servant | Delaware |
| 27 | Edward Callahan | 14 | Son | — | Delaware |
| 28 | William Callahan | 9 | Son | — | Delaware |
| 29 | Peter J. Mcdonough | 67 | Head | — | Ireland |
| 30 | Bridget Mcdonough | 67 | Wife-H | — | Ireland |
| 31 | Joseph Nichols | 50 | Head | Patrolman | Delaware |
| 32 | Anna Nichols | 45 | Wife-H | — | New Jersey |
| 33 | Joseph Nichols | 17 | Son | — | Delaware |
| 34 | Edward Nichols | 15 | Son | — | New Jersey |
| 35 | Alfred Nichols | 13 | Son | — | New Jersey |
| 36 | Catherine Nichols | 20 | Daughter | Laundress | New Jersey |
| 37 | Edward Nichols | 12 | Son | — | Delaware |
| 38 | George Nichols | 10 | Son | — | Delaware |
| 39 | Ida Nichols | 8 | Daughter | — | Delaware |
| 40 | Betty Nichols | 6 | Daughter | — | Delaware |
| 41 | Anthony Luffey | 10 | Boarder | — | Maryland |
| 42 | Andrew Luffey | 29 | Boarder | Welder | Delaware |
| 43 | Charles Bonna | 29 | Head | — | Delaware |
| 44 | Mary Bonna | 25 | Wife-H | — | Delaware |
| 45 | Charles Bonna | 1 | Son | — | Delaware |
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)