MK
Mary Knox — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this Mary Knox across the 1930 and 1940 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1923), then head of a 9-person household.
Age 7
b. ~1923
Female
Daughter
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | Knox |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Canada English |
| Mother's Birthplace | Irish Free State |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | City Of Malden |
| Est. Birth Year | ~1923 |
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.
9 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Helen Knox | Spouse | — | 42 | ~1888 |
| Mary Knox | Daughter | — | 7 | ~1923 |
| Paul Knox | Son | — | 10 | ~1920 |
| Annette Knox | Daughter | — | 15 | ~1915 |
| George Knox | Son | — | 13 | ~1917 |
| Kenneth Knox | Son | — | 11 | ~1919 |
| George Knox | Head | — | 41 | ~1889 |
| Leo Knox | Son | — | 5 | ~1925 |
| Eleanor Knox | Daughter | — | 8 | ~1922 |
Census Appearances
1930
Middlesex, Massachusetts
Daughter, age 7
Middlesex, Massachusetts · implied b. ~1923 — 9 household members
| Surname | Knox |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Canada English |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 16
Middlesex-County, Massachusetts · implied b. ~1924 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knox |
| Given Name | Marguerite |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Malden (City) |
| 1935 Residence (County) | Middlesex |
| Highest Grade | Hs 3 |
| 1935 Residence | Same place |
| 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 Knox across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Knox
Daughter · 1930 · age 7 · b. ~1923 · Massachusetts
★ You are viewing this record
Sibling
Leo Knox
Sibling · 1930 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kenneth Knox
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Annette Knox
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Knox
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Knox
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eleanor Knox
Sibling · 1930 · age 8
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:massachusettscensus00reel922:0744)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Margaret Mahoney | 11 | Daughter | — | Massachusetts |
| 52 | Louise Mahoney | 8 | Daughter | — | Massachusetts |
| 53 | Thomas J. Gonnell | 52 | Head | Operator | Irish Free State |
| 54 | Helen G. Gonnell | 26 | Wife | Stenographer | Massachusetts |
| 55 | George M. Knox | 41 | Head | Plasterer | Canada English |
| 56 | Helen M. Knox | 42 | Wife | — | Irish Free State |
| 57 | Annette M. Knox | 15 | Daughter | — | Massachusetts |
| 58 | George F. Knox | 13 | Son | — | Massachusetts |
| 59 | Kenneth W. Knox | 11 | Son | — | Massachusetts |
| 60 | Paul J. Knox | 10 | Son | — | Massachusetts |
| 61 | Eleanor Knox | 8 | Daughter | — | Massachusetts |
| 62 | Mary M. Knox THIS PERSON | 7 | Daughter | — | Massachusetts |
| 63 | Leo H. Knox | 5 | Son | — | Massachusetts |
| 64 | Joseph F. Mullen | 42 | Head | Clerk | Canada English |
| 65 | Annie M. Mullen | 49 | Wife | — | Canada English |
| 66 | Joseph F. Jr. Mullen | 20 | Son | Apprentice | Massachusetts |
| 67 | Anna M. Mullen | 17 | Daughter | — | Massachusetts |
| 68 | Evelyn M. Mullen | 13 | Daughter | — | Massachusetts |
| 69 | John H. Mc Donald | 61 | Head | Plumber | Massachusetts |
| 70 | Mary F. Mc Donald | 56 | Wife | — | Massachusetts |
| 71 | Robert T. Mc Donald | 27 | Son | Salesman | Massachusetts |
| 72 | John M. Mc Donald | 23 | Son | Clerk | Massachusetts |
| 73 | Russell L. Holden | 26 | Head | Salesman | Canada English |
| 74 | Alberta V. Holden | 26 | Wife | — | Canada English |
| 75 | Althea Gamache | 23 | Roomer | Nurse | Massachusetts |
| 76 | Lansing J. Martin | 46 | Head | Mechanic | Vermont |
| 77 | Edna R. Martin | 46 | Wife | — | Canada English |
| 78 | Virginia Martin | 15 | Daughter | — | Massachusetts |
| 79 | Constance R. Martin | 11 | Daughter | — | Massachusetts |
| 80 | Norma Martin | 5 | Daughter | — | Massachusetts |
| 81 | Lillian J. Ring | 60 | Roomer | Clerk | Canada English |
| 82 | Arthur H. Ring | 51 | Head | Superintendent | Canada English |
| 83 | Mabel A. Ring | 47 | Wife | — | Massachusetts |
| 84 | Mabelle A. Ring | 23 | Daughter | Registered Nurse | Massachusetts |
| 85 | Dorothy M. Ring | 20 | Daughter | Tabulator | Massachusetts |
| 86 | Ralph M. Ring | 16 | Son | — | Massachusetts |
| 87 | Hariette E. Ring | 14 | Daughter | — | Massachusetts |
| 88 | Charles M. Neal | 57 | Head | Stevedore | Canada English |
| 89 | Elizabeth Neal | 53 | Wife | — | Canada English |
| 90 | Ruth Blanchard | 25 | Daughter | Waitress | Massachusetts |
| 91 | Emma Peppard | 60 | Sister-in-law | Stitcher | Canada English |
| 92 | Stella Brown | 25 | Roomer | Trained Nurse | Canada English |
| 93 | Grace M. Blanchard | 4 | Granddaughter | — | Massachusetts |
| 94 | Walter H. Muehlberg | 62 | Head | Cutter | Germany |
| 95 | Veronica Muehlberg | 50 | Wife | — | Canada English |
| 96 | Walter K. Muehlberg | 17 | Son | — | Massachusetts |
| 97 | Burton F. Wilson | 25 | Roomer | Assistant | Canada English |
| 98 | Samuel O. Hopkins | 60 | Roomer | Box Maker | Canada English |
| 99 | Walter Goodwin | 57 | Head | Captain | Canada English |
| 100 | Harriet M. Goodwin | 53 | Wife | — | Maine |
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)