MF
Mary Frederick — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Baltimore, Maryland
Our Model Tree links this Mary Frederick across the 1930 and 1940 US Censuses in Baltimore, Maryland (XGBoost, ~Confirmed) — first a daughter (b.~1929), then head of a 8-person household.
Age 1
b. ~1929
Female
Daughter
Born: Maryland
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Baltimore, Maryland |
| Surname | Frederick |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Maryland |
| Additional Details | |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Est. Birth Year | ~1929 |
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.
8 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Arthur Frederick | Son | — | 5 | ~1925 |
| Edward Frederick | Son | — | 3 | ~1927 |
| Mary Frederick | Daughter | — | 1 | ~1929 |
| Agnes Frederick | Daughter | — | 12 | ~1918 |
| Eva Frederick | Spouse | — | 32 | ~1898 |
| Joseph Frederick | Head | — | 34 | ~1896 |
| Doris Frederick | Daughter | — | 10 | ~1920 |
| Joyce Frederick | Daughter | — | 9 | ~1921 |
Census Appearances
1930
Baltimore, Maryland
Daughter, age 1
Baltimore, Maryland · implied b. ~1929 — 8 household members
| Surname | Frederick |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Daughter, age 12
Baltimore-City-County, Maryland · implied b. ~1928 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frederick |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | BALTIMORE |
| 1935 Residence (County) | Baltimore City |
| Occupation | No |
| Industry | No |
| Class of Worker | No |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
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 Frederick across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Frederick
Daughter · 1930 · age 1 · b. ~1929 · Maryland
★ You are viewing this record
Sibling
Arthur Frederick
Sibling · 1930 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Frederick
Sibling · 1930 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Doris Frederick
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Agnes Frederick
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joyce Frederick
Sibling · 1930 · age 9
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 — Baltimore, Maryland
Open full size
1930 US Federal Census — Baltimore, Maryland
Page Contents
50 people indexed on this census page (ia:1930:15thcensus857unit:0175)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Emily V Mason | 6 | Daughter | — | Maryland |
| 52 | Archie Mason | 58 | Boarder | — | West Virginia |
| 53 | Annie Mason | 36 | Boarder | Saleslady | Maryland |
| 54 | Sallie Mason | 24 | Sister-in-law | Saleslady | Maryland |
| 55 | Audrey D Mason | 2 | Niece | — | Maryland |
| 56 | Manson R Todd | 21 | Head | Trucker | Maryland |
| 57 | Mark L Todd | 42 | Brother | Salesman | Maryland |
| 58 | Trutta B Todd | 16 | Sister | Presser | Maryland |
| 59 | Irvine W Craig | 55 | Head | Watchman | Maryland |
| 60 | Emma M Craig | 45 | Wife | — | Maryland |
| 61 | Lawrence W Craig | 24 | Son | Learner | Maryland |
| 62 | Edna E Craig | 23 | Daughter-in-law | — | Maryland |
| 63 | Joseph W Frederick | 34 | Head | Brakeman | Ohio |
| 64 | Eva M Frederick | 32 | Wife | — | Maryland |
| 65 | Agnes E Frederick | 12 | Daughter | — | Maryland |
| 66 | Doris J Frederick | 10 | Daughter | — | Maryland |
| 67 | Joyce J Frederick | 9 | Daughter | — | Maryland |
| 68 | Arthur A Frederick | 5 | Son | — | Maryland |
| 69 | Edward J Frederick | 3 | Son | — | Maryland |
| 70 | Mary E Frederick THIS PERSON | 1 | Daughter | — | Maryland |
| 71 | Frederick W Lotz | 57 | Head | Driver | Maryland |
| 72 | Annie E Lotz | 55 | Wife | — | Germany |
| 73 | Arthur F Lotz | 25 | Son | Helper | Maryland |
| 74 | Emory C Barky | 41 | Head | Lineman | Maryland |
| 75 | Susan H Barky | 36 | Wife | — | Virginia |
| 76 | Robert C Mccand | 45 | Head | Gardener | Maryland |
| 77 | Frances W Mccand | 48 | Wife | — | Maryland |
| 78 | Ruth E Mccand | 21 | Daughter | Stock Clerk | Maryland |
| 79 | Charlotte S Mccand | 17 | Daughter | Office Work | Maryland |
| 80 | Annie V Shea | 45 | Head | — | Maryland |
| 81 | Marshall E Shea | 26 | Son | Salesman | Maryland |
| 82 | Anna G Shea | 21 | Daughter-in-law | — | Maryland |
| 83 | Anna G Shea | 4 | Granddaughter | — | Maryland |
| 84 | June E Shea | 1 | Granddaughter | — | Maryland |
| 85 | Richard E Shea | 22 | Son | — | Maryland |
| 86 | William C Shea | 11 | Son | — | Maryland |
| 87 | James N Shea | 10 | Son | — | Maryland |
| 88 | Herman F Haines | 53 | Boarder | Painter | Maryland |
| 89 | Charles E Haines | 18 | Boarder | Farmer | Maryland |
| 90 | Lily M Clark | 58 | Head | — | Maryland |
| 91 | Clifton H Clark | 31 | Son | Driver | Maryland |
| 92 | Irving B Clark | 28 | Son | Driver | Maryland |
| 93 | Robert S Clark | 23 | Son | Driver | Maryland |
| 94 | Basil C Clark | 48 | Boarder | Gardener | Maryland |
| 95 | Albert H Miller | 54 | Head | Farmer | Maryland |
| 96 | Mary E Miller | 71 | Wife | — | Maryland |
| 97 | Edith F Miller | 18 | Granddaughter | Marker | Maryland |
| 98 | John W Kaylor | 52 | Son-in-law | Painter | Maryland |
| 99 | Sadie D Kaylor | 43 | Daughter | Weaver | Maryland |
| 100 | Edward C Harvey | 43 | Head | Chief Engineer | Maryland |
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)