JC
John Costello — 1930 US Census Record
Model Tree available1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this John Costello across the 1910, 1920 and 1930 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed), with identified parents Charles & Mary — first a son (b.~1903), then head of a 3-person household.
Age 27
b. ~1903
Male
Son
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | Costello |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Occupation | Clerk |
| Industry | Gas Company |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Clerk |
| Township / Ward | City Of Malden |
| Est. Birth Year | ~1903 |
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.
3 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Costello | Son | — | 27 | ~1903 |
| Mary Costello | Other | — | 56 | ~1874 |
| Charles Costello | Head | — | 57 | ~1873 |
Census Appearances
1910
Middlesex, Massachusetts
Son, age 7
Middlesex, Massachusetts · implied b. ~1903 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costello |
| Given Name | John T |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1920
Middlesex, Massachusetts
Son, age 17
Middlesex, Massachusetts · implied b. ~1903 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costello |
| Given Name | John T. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 27
Middlesex, Massachusetts · implied b. ~1903 — 3 household members
| Surname | Costello |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Clerk |
| Industry | Gas Company |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| 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 John Costello across 3 US Census years (1910, 1920 and 1930) in Middlesex, Massachusetts, using XGBoost record linkage. Identified parents: father Charles Costello (~0.92 confidence) and mother Mary Costello (~0.92 confidence) and mother Mary Costello (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Charles Costello
b. ~1872
Source father
● Household
· direct · ~0.92
Mother
Mary Costello
b. ~1873
Source mother
● Household
· direct · ~0.92
Mother
Mary Costello
b. ~1881
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Costello
Son · 1930 · age 27 · b. ~1903 · Massachusetts
★ You are viewing this record
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:massachusettscensus00reel923:0143)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Ruth Skilling | 33 | Wife-H | — | Connecticut |
| 52 | Mildred Skilling | 5 | Daughter | — | Massachusetts |
| 53 | Eunice Rogers | 83 | Head | — | Massachusetts |
| 54 | William C. Bond | 60 | Son-in-law | Jeweler | Massachusetts |
| 55 | Mabel S. Bond | 55 | Daughter | — | Massachusetts |
| 56 | Marian G. Bond | 28 | Granddaughter | Teacher | Massachusetts |
| 57 | Camilla Bond | 20 | Granddaughter | Clerk | Massachusetts |
| 58 | Nicholas Gallagher | 43 | Head | Physician | Massachusetts |
| 59 | Anna Gallagher | 35 | Wife-H | — | Massachusetts |
| 60 | Augusta Gallagher | 11 | Daughter | — | Massachusetts |
| 61 | Francisca Gallagher | 8 | Daughter | — | Massachusetts |
| 62 | Nathaniel Gallagher | 3 | Son | — | Massachusetts |
| 63 | Paul Gallagher | 1 | Son | — | Massachusetts |
| 64 | Mabelle Miller | 31 | Servant | Domestic | Massachusetts |
| 65 | William H. Mcbain | 56 | Head | Doctor | New York |
| 66 | Mary D. Mcbain | 70 | Wife-H | — | Massachusetts |
| 67 | Christine Mehegan | 22 | Maid | Domestic | Irish Free State |
| 68 | William J. Jr. Mcbain | 8 | Son | — | Massachusetts |
| 69 | Bradford Parsons | 26 | Head | Carpenter | Canada English |
| 70 | Mary Parsons | 29 | Wife-H | — | Canada English |
| 71 | Gloria Parsons | 3 | Daughter | — | Massachusetts |
| 72 | John Parsons | 17 | Brother | — | Canada English |
| 73 | Patrick Donnelly | 65 | Head | Laborer | Irish Free State |
| 74 | Margaret Donnelly | 32 | Daughter | — | Massachusetts |
| 75 | John Donnelly | 37 | Son | Undertaker | Massachusetts |
| 76 | Mary Kelly | 75 | Aunt | — | Irish Free State |
| 77 | John Sheehan | 26 | Boarder | Rubber Worker | Canada English |
| 78 | John Gallagher | 30 | Head | Broker | Massachusetts |
| 79 | Teresa Gallagher | 30 | Wife-H | — | Massachusetts |
| 80 | Edward J. Harrington | 59 | Head | Laborer | New Hampshire |
| 81 | Margaret Harrington | 60 | Wife-H | — | Irish Free State |
| 82 | Edward Harrington | 30 | Son | Police Officer | Massachusetts |
| 83 | Walter Harrington | 28 | Son | Laborer | Massachusetts |
| 84 | Hazel Harrington | 24 | Daughter | Teacher | Massachusetts |
| 85 | Marguerite Harrington | 17 | Daughter | — | Massachusetts |
| 86 | Arthur D. Brunell | 34 | Head | Sheet Metal Worker | Massachusetts |
| 87 | Viola D. Brunell | 33 | Wife-H | — | Massachusetts |
| 88 | Mary Brunell | 9 | Daughter | — | Massachusetts |
| 89 | Ralph Biagiotti | 27 | Head | Bookkeeper | Massachusetts |
| 90 | Mary Biagiotti | 29 | Wife-H | — | Canada English |
| 91 | Ralph Jr. Biagiotti | 1 | Son | — | Massachusetts |
| 92 | Thomas J. Garrity | 71 | Head | — | England |
| 93 | Margaret T. Garrity | 71 | Wife-H | — | Massachusetts |
| 94 | Annie L. Monahan | 40 | Daughter | Saleslady | Massachusetts |
| 95 | Margaret Monahan | 12 | Granddaughter | — | Massachusetts |
| 96 | Alfred Monahan | 8 | Grandson | — | Massachusetts |
| 97 | Helen Garrity | 23 | Granddaughter | Operator | Massachusetts |
| 98 | Charles J. Costello | 57 | Head | Police Officer | Massachusetts |
| 99 | Mary J. Costello | 56 | Wife-H | — | Massachusetts |
| 100 | John Costello THIS PERSON | 27 | Son | Clerk | Massachusetts |
Pedigree Summary
John
Gen 1 · 3 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)