IP
Ida Peterson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Ida Peterson across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Peter & Peter — first a daughter (b.~1898), then head of a 3-person household.
Age 42
b. ~1898
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Peterson |
| Given Name | Ida C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | MALDEN CITY |
| 1935 Residence (County) | MIDDLESEX |
| Additional Details | |
| Occupation | bookkeeper |
| Industry | laundry office |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1500 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Bookkeeper |
| Township / Ward | Malden City |
| Est. Birth Year | ~1898 |
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 1940 census.
| Name | Relation to head | Relative to Ida | Age | Birth yr |
|---|---|---|---|---|
| Ida Peterson | Daughter | — | 42 | ~1898 |
| Peter Peterson | Head | — | 70 | ~1870 |
| Mable Peterson | Daughter | — | 35 | ~1905 |
Census Appearances
1920
Middlesex, Massachusetts
Daughter, age 21
Middlesex, Massachusetts · implied b. ~1899 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Petterson |
| Given Name | Ida |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Canada |
| Occupation | Stenographer |
| Industry | Waterproof Co |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Daughter, age 32
Middlesex, Massachusetts · implied b. ~1898 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Petersen |
| Given Name | Ida L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Canada-English |
| Occupation | Stenographer |
| Industry | Insurance office |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 42
Middlesex-County, Massachusetts · implied b. ~1898 — 3 household members
| Surname | Peterson |
| Given Name | Ida C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | MALDEN CITY |
| 1935 Residence (County) | MIDDLESEX |
| Occupation | bookkeeper |
| Industry | laundry office |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1500 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| 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 Ida Peterson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Peter Petterson (~0.92 confidence) and father Peter Petersen (~0.92 confidence) and father Peter Peterson (~0.92 confidence) and mother Carrie Petterson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Peter Petterson
b. ~1870
Source father
● Household
· direct · ~0.92
Father
Peter Petersen
b. ~1870
Source father
● Household
· direct · ~0.92
Father
Peter Peterson
b. ~1870
Source father
● Household
· direct · ~0.92
Mother
Carrie Petterson
b. ~1873
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Ida Peterson
Daughter · 1940 · age 42 · b. ~1898 · Massachusetts
★ You are viewing this record
Sibling
Mable Peterson
Sibling · 1940 · age 35
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
1940 US Federal Census — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01609-00097)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Irving S. Wood | 57 | Head | Laborer | Massachusetts |
| 2 | Hannah M. Wood | 45 | Wife | — | Massachusetts |
| 3 | Kenneth Bruce | 65 | Lodger | Research Worker | New Hampshire |
| 4 | Leon A. Hartwell | 60 | Head | Commercial Traveler | Massachusetts |
| 5 | Abbie S. Hartwell | 58 | Wife | — | New Hampshire |
| 6 | George Alley | 69 | Head | Lodging House Keeper | Massachusetts |
| 7 | Annie Alley | 62 | Wife | — | Canada |
| 8 | Donald Alley | 20 | Son | — | Massachusetts |
| 9 | Frank P. Mauer | 50 | Head | Freight Agent | Massachusetts |
| 10 | Lucy B. Mauer | 49 | Wife | — | Massachusetts |
| 11 | Frank P. Jr. Mauer | 17 | Son | — | Massachusetts |
| 12 | Gordon E. Robinson | 39 | Head | Teller | Massachusetts |
| 13 | Glenna S. Robinson | 40 | Wife | — | England |
| 14 | Russell L. Robinson | 17 | Son | — | Massachusetts |
| 15 | Kenneth A. Robinson | 15 | Son | — | Massachusetts |
| 16 | Carl H. Carlson | 36 | Head | Steam Fitter | Sweden |
| 17 | Margaret Carlson | 30 | Wife | — | Massachusetts |
| 18 | Margaret S. Carlson | 7 | Daughter | — | Massachusetts |
| 19 | Wayne Sr. Mac Farlane | 71 | Father-in-law | — | Canada |
| 20 | Charles E. Martin | 44 | Head | Plumbers Helper | Massachusetts |
| 21 | Jessie Martin | 44 | Wife | — | Massachusetts |
| 22 | Natalie L. Martin | 18 | Daughter | — | Rhode Island |
| 23 | Estelle S. Martin | 17 | Daughter | — | Rhode Island |
| 24 | Wayne Jr. Mac Farlane | 37 | Brother-in-law | Mechanic | Massachusetts |
| 25 | John B. Magnuson | 47 | Head | Cabinet Maker | Sweden |
| 26 | Ingeborg Magnuson | 40 | Wife | — | Sweden |
| 27 | Herbert Magnuson | 17 | Son | — | Massachusetts |
| 28 | Carl M. Ericson | 57 | Head | Brass Finisher | Sweden |
| 29 | Wilhelmina Ericson | 58 | Wife | — | Sweden |
| 30 | Ruth Edgar | 19 | Niece | — | Massachusetts |
| 31 | Gustav A. Skogberg | 57 | Lodger | Upholsterer | Sweden |
| 32 | Peter Peterson | 70 | Head | Steward | Denmark |
| 33 | Ida C. Peterson THIS PERSON | 42 | Daughter | Bookkeeper | Massachusetts |
| 34 | Mable B. Peterson | 35 | Daughter | — | Massachusetts |
| 35 | Alexander Mac Kenzie | 72 | Head | — | Canada |
| 36 | Christina Mac Kenzie | 73 | Wife | — | Canada |
| 37 | Elizabeth N. Mac Kenzie | 34 | Daughter | Secretary | Massachusetts |
| 38 | Eric Olson | 30 | Lodger | Carpenter | Sweden |
| 39 | Ends Hebe | None | BLOCK | — | — |
| 40 | Frederic Berthel | 46 | Head | Foreman | Massachusetts |
Pedigree Summary
Ida + 1 sibling
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 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)