We search millions of historical and current public records to identify people with Jewish ancestry.
For each contact we calculate his/her "Jewishness" - the probability that he/she is halachically Jewish.
For more details see What is "Jewishness"?
The Jewishness of a contact is the probability that he or she is halachically Jewish i.e. he/she is a child of a halachically Jewish mother.
For example "Abraham Katz" has a Jewishness of "28" which means about 28 out of 100 Abraham Katz's in America are Jewish.
For buying we divide contacts into 3 Jewishness categories:
We only include contacts with at least 2% Jewish probability in our data based on the Pew Research Study that found about 1% of the American population is halachically Jewish*. This means all our contacts are at least twice as likely to be Jewish than the average American.
We calculate Jewish probability using the contact's first and last name based on the statistical analysis of over 87 million immigration records.
When immigrants came to America they had to specify their name and "Race or people" as shown on the immigration document below.
We analyzed over 87 million immigration records from New York Ports between 1820 and 1957 (sources below) for:
We assumed all those with race as "Hebrew" or "Jewish" were Jewish and 80% of those with race as "Israeli" or "Israelian" were Jewish (based on Israeli census data between 1948 and 1957)
After compiling data on over 15,000 common Jewish first/last names we did statistical analysis to compute the probability of any first/last name combination being Jewish.
Results of our linear regression using least-squares estimation had a significance of 5.93E-14 (F signficance value) with P-values for "First Name Jewish Probability" and "Last Name Jewish Probability" coefficients both < 0.00001 showing high significance.
To our knowledge this is the most in-depth analysis of Jewish name probability available.
E-mail firstname.lastname@example.org if you want more details on our study.
Passenger Lists of Vessels Arriving at New York, New York, 1820-1897. Microfilm Publication M237, 675 rolls. Records of the U.S. Customs Service, Record Group 36. National Archives at Washington, D.C.
Passenger and Crew Lists of Vessels Arriving at New York, New York, 1897-1957. Microfilm Publication T715, 8892 rolls. Records of the Immigration and Naturalization Service; National Archives at Washington, D.C.
Supplemental Manifests of Alien Passengers and Crew Members Who Arrived on Vessels at New York, New York, Who Were Inspected for Admission, and Related Index, compiled 1887-1952. Microfilm Publication A3461, 21 rolls. ARC ID: 3887372. RG 85, Records of the Immigration and Naturalization Service, 1787-2004; Records of the Immigration and Naturalization Service; National Archives, Washington, D.C.
Index to Alien Crewmen Who Were Discharged or Who Deserted at New York, New York, May 1917-Nov. 1957. Microfilm Publication A3417. ARC ID: 4497925. National Archives at Washington, D.C.
Passenger Lists, 1962-1972, and Crew Lists, 1943-1972, of Vessels Arriving at Oswego, New York. Microfilm Publication A3426. ARC ID: 4441521. National Archives at Washington, D.C.
*The Pew Study considered as Jewish "anyone who described themselves as Jewish or partially Jewish by religion, to anyone who identified themselves as Jewish or partially Jewish aside from religion, and to anyone who was raised Jewish or partially Jewish or had a Jewish parent – even if they do not think of themselves as Jewish." Their total population estimate for Jews in America based on these criteria was 5.3 million - about 2.2% of the US Adult population in 2013. They reported the intermarriage rate was about 50% so we assumed about half of those they considered Jewish were halachically Jewish i.e. 1% of the American population. Therefore in our data we consider include all contacts with 2% Jewish probability greater which means all our contacts are at least twice as likely to be Jewish than the average American.
We compile data from public sources including property tax and business registration records.
At the right of your data table in the "List" tab is a column for "Source" which shows the data source for each record.
For each NYC.gov record you will see "BBL:" listed in the source field.
BBL stands for "Borough", "Block", "Lot" and each are seperated by dashes.
For example "BBL: 3-01272-0062" means Borough=3 (Brooklyn), Block=01272 and Lot=0062. If you enter these values in the NYC.gov search you will find the property cited.
We determine "Value" from NYC.gov "Market Value", "Main Home" from the NYC.gov "STAR Exemption" (for a property to get STAR exemption it must be the owner's primary residence see here) and "Age" from NYC.gov "STAR Exemption Type" (Basic or Enhanced).
For NY DOS records you just have to click the "NY DOS" link to view the source record.
We compile names from the "DOS Process", "Registered Agent" and "Chief Executive Officer" fields.
We use official government documents for all our data and update monthly so our data is highly accurate.
You can test the accuracy of any record by viewing its "Source" (column at right in data table). For more info on data sources click here.
No, we do not sell the same data to more than one customer.
Once you purchase contacts they are exclusively yours - we will never sell these contacts again to anyone else!
You can see proof of this by looking at the number of available contacts in a certain zip code before and after purchasing. After purchasing you will notice the available contacts in this zip code have decreased for all customers.
If you no longer can support the contacts that you bought please contact us and we will re-assign these contacts to another Rabbi in your area.
Yes, please email email@example.com with your current database and we will give you an estimate for merging.
The cost is usually between $50 to $150 depending on database size and complexity.
Please send us your database in one of the following formats:
Acquiring and updating our data takes a considerable amount of time/money so we require a minimum donation based on the amount and type of data we provide you.
We provide 4 types of contacts:
All our contacts are at least twice as likely to be Jewish as the average American (see details above):
All prices are in USD per contact.
Number refers to the total number of contacts you buy at once.
So if you buy 100 of each type (300 total) the prices would be $0.45, $0.25 and $0.25 per contact respectively.
So the more you buy at once the cheaper it is!
|Type / Number||< 100||100 to 249||250 to 499||500 to 749||>750 to 999||1,000+|
|New home owner at primary address||0.50||0.45||0.41||0.38||0.36||0.35|
|Home owner at primary address||0.50||0.45||0.41||0.38||0.36||0.35|
Feel free to give more than required - we'll use every penny to improve and maintain our services!