Ontario Ave, Plainview, NY Property Records

Nassau County and Oyster Bay Town property records for 51 addresses on Ontario Ave, Plainview, NY · Last verified July 2026

Ontario Ave Highlights

Properties 51
Median Sale Price $595,000
Deeds and Mortgages on File 44
Median Price per Sqft $426
Owner Occupied 92%
Median Annual Tax Bill $14,316
Median Year Built 1954
Median Ownership Tenure 9 years

Properties on Ontario Ave

Owner names and prior sale amounts shown locked below are available instantly with a free trial.

3 Ontario Ave

2 ba · 1,419 sqft · built 1953 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$9,6442025 2 Names on Record Owner Occupied AssessorUpdated Jun 2026

4 Ontario Ave

3 ba · 1,325 sqft · built 1954 · 0.14 acres

Last Sale Tax Bill Prior Sale Owner Records
$565,000Oct 2020 $14,8812025 1 Name on Record Owner Occupied Assessor + 5 DocumentsUpdated Jun 2026

5 Ontario Ave

2 ba · 1,589 sqft · built 1953 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$10,5992025 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

6 Ontario Ave

2 ba · 1,326 sqft · built 1954 · 0.14 acres

Last Sale Tax Bill Prior Sale Owner Records
$660,000May 2021 $13,9302025 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

7 Ontario Ave

2 ba · 1,536 sqft · built 1953 · 0.14 acres

Last Sale Tax Bill Prior Sale Owner Records
$438,000Dec 2004 $14,8542025 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

8 Ontario Ave

2 ba · 1,683 sqft · built 1954 · 0.14 acres

Last Sale Tax Bill Prior Sale Owner Records
$760,000Jan 2022 $14,8512025 Amount on Record Feb 1996 2 Names on Record Owner Occupied Assessor + 2 DocumentsUpdated Jun 2026

9 Ontario Ave

2 ba · 1,419 sqft · built 1954 · 0.14 acres

Last Sale Tax Bill Prior Sale Owner Records
$645,000Feb 2024 $16,8682025 Amount on Record Jan 1999 1 Name on Record Assessor + 1 DocumentUpdated Jun 2026

10 Ontario Ave

2 ba · 1,419 sqft · built 1954 · 0.14 acres

Last Sale Tax Bill Prior Sale Owner Records
$250,000Apr 1999 $13,0722025 2 Names on Record Owner Occupied AssessorUpdated Jun 2026

11 Ontario Ave

4 bd · 2 ba · 1,653 sqft · built 1953 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$600,000Jul 2022 $17,0492025 Amount on Record Jun 2014 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

12 Ontario Ave

2 ba · 1,590 sqft · built 1952 · 0.14 acres

Last Sale Tax Bill Prior Sale Owner Records
$485,000Oct 2017 $14,3162025 —Nov 1999 1 Name on Record Owner Occupied Assessor + 2 DocumentsUpdated Jun 2026

14 Ontario Ave

2.5 ba · 1,419 sqft · built 1954 · 0.14 acres

Last Sale Tax Bill Prior Sale Owner Records
$530,000Jul 2018 $14,6732025 Amount on Record Feb 2005 2 Names on Record Owner Occupied Assessor + 2 DocumentsUpdated Jun 2026

15 Ontario Ave

2 ba · 1,325 sqft · built 1953 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$479,000Apr 2017 $15,7722025 —Jul 2012 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

20 Ontario Ave

2 ba · 1,325 sqft · built 1954 · 0.144 acres

Last Sale Tax Bill Prior Sale Owner Records
$12,8942025 2 Names on Record Owner Occupied AssessorUpdated Jun 2026

21 Ontario Ave

3 ba · 2,143 sqft · built 1952 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$348,000Jan 2012 $17,9402025 2 Names on Record Owner Occupied AssessorUpdated Jun 2026

22 Ontario Ave

3 bd · 2 ba · 1,419 sqft · built 1952 · 0.14 acres

Last Sale Tax Bill Prior Sale Owner Records
$560,000Mar 2021 $13,3362025 Amount on Record Oct 2015 1 Name on Record Assessor + 1 DocumentUpdated Jun 2026

23 Ontario Ave

2 ba · 1,434 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$14,3162025 2 Names on Record Owner Occupied AssessorUpdated Jun 2026

24 Ontario Ave

2 ba · 1,325 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$288,000Nov 2001 $13,0422025 Amount on Record Mar 1995 2 Names on Record Owner Occupied AssessorUpdated Jun 2026

25 Ontario Ave

2.5 ba · 1,325 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$483,000Sep 2017 $14,3162025 Amount on Record May 2001 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

26 Ontario Ave

4 bd · 2 ba · 1,503 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$450,000Dec 2014 $14,9402025 Amount on Record Jun 2014 2 Names on Record Owner Occupied Assessor + 3 DocumentsUpdated Jun 2026

27 Ontario Ave

2 ba · 1,325 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$415,000Jul 2011 $12,8942025 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

28 Ontario Ave

2 ba · 1,653 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$455,000May 2020 $13,8712025 —Jun 2018 1 Name on Record Owner Occupied Assessor + 2 DocumentsUpdated Jun 2026

29 Ontario Ave

2 ba · 1,310 sqft · built 1952 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$406,800Aug 2008 $15,2992025 2 Names on Record Owner Occupied AssessorUpdated Jun 2026

30 Ontario Ave

2 ba · 1,325 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$554,000Feb 2021 $13,8112025 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

31 Ontario Ave

4 ba · 2,278 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$480,000Feb 2005 1 Name on Record Owner Occupied AssessorUpdated Jun 2026

36 Ontario Ave

4 ba · 2,073 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$585,000Sep 2018 $16,5142025 Amount on Record Jul 2010 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

37 Ontario Ave

2 ba · 1,325 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$16,0692025 2 Names on Record Owner Occupied AssessorUpdated Jul 2026

38 Ontario Ave

2 ba · 1,325 sqft · built 1952 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
—Feb 2012 $10,7932025 2 Names on Record Owner Occupied AssessorUpdated Jun 2026

40 Ontario Ave

2 ba · 1,325 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$190,000Oct 1997 $12,9742025 —Oct 1997 1 Name on Record Owner Occupied AssessorUpdated Jun 2026

41 Ontario Ave

2 ba · 1,325 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$595,000Dec 2020 $13,4552025 Amount on Record Mar 2016 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

42 Ontario Ave

5 bd · 2 ba · 2,412 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$490,000Jun 2015 $19,9002025 1 Name on Record Owner Occupied AssessorUpdated Jun 2026

43 Ontario Ave

2 ba · 1,419 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$14,2572025 2 Names on Record Owner Occupied AssessorUpdated Jun 2026

44 Ontario Ave

1 ba · 1,325 sqft · built 1952 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$340,000Jun 2011 $15,0882025 1 Name on Record AssessorUpdated Jun 2026

45 Ontario Ave

5 bd · 2 ba · 1,419 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$397,500Dec 2013 $15,2992025 —Jun 2005 2 Names on Record Owner Occupied AssessorUpdated Jun 2026

46 Ontario Ave

1.5 ba · 1,325 sqft · built 1952 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$530,000Feb 2022 $13,3662025 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

47 Ontario Ave

1 ba · 1,325 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$730,000Jul 2023 $15,4152025 Amount on Record Mar 2002 2 Names on Record Owner Occupied Assessor + 2 DocumentsUpdated Jun 2026

52 Ontario Ave

2 ba · 1,887 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$617,000Nov 2018 $17,7022025 Amount on Record Feb 2007 2 Names on Record Owner Occupied Assessor + 2 DocumentsUpdated Jun 2026

53 Ontario Ave

2 ba · 1,325 sqft · built 1954 · 0.183 acres

Last Sale Tax Bill Prior Sale Owner Records
—Mar 2002 $12,0032025 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

54 Ontario Ave

4 bd · 2 ba · 1,325 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$795,000Nov 2024 $16,6032025 Amount on Record Aug 2018 2 Names on Record Assessor + 1 DocumentUpdated Jun 2026

55 Ontario Ave

1 ba · 1,419 sqft · built 1954 · 0.137 acres

Last Sale Tax Bill Prior Sale Owner Records
$13,0722025 2 Names on Record Owner Occupied AssessorUpdated Jun 2026

56 Ontario Ave

2 ba · 1,576 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$374,900Aug 2002 $15,2702025 Amount on Record Dec 1996 2 Names on Record Owner Occupied AssessorUpdated Jun 2026

57 Ontario Ave

1 ba · 1,525 sqft · built 1954 · 0.149 acres

Last Sale Tax Bill Prior Sale Owner Records
$11,6882025 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

58 Ontario Ave

2 ba · 1,310 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
—May 2002 $12,8342025 1 Name on Record Owner Occupied AssessorUpdated Jun 2026

59 Ontario Ave

4 bd · 3 ba · 2,695 sqft · built 2017 · 0.149 acres

Last Sale Tax Bill Prior Sale Owner Records
$985,000Apr 2018 $20,7912025 Amount on Record Mar 2017 1 Name on Record Owner Occupied Assessor + 4 DocumentsUpdated Jun 2026

60 Ontario Ave

1.5 ba · 1,325 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$188,000Dec 1996 $14,9132025 —Dec 1996 1 Name on Record Owner Occupied AssessorUpdated Jun 2026

61 Ontario Ave

2 ba · 1,325 sqft · built 1954 · 0.149 acres

Last Sale Tax Bill Prior Sale Owner Records
$530,000Feb 2022 $13,2582025 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

62 Ontario Ave

2 ba · 1,618 sqft · built 1954 · 0.142 acres

Last Sale Tax Bill Prior Sale Owner Records
$15,5072025 2 Names on Record Owner Occupied AssessorUpdated Jun 2026

67 Ontario Ave

2 ba · 1,325 sqft · built 1954 · 0.181 acres

Last Sale Tax Bill Prior Sale Owner Records
$13,9332025 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

68 Ontario Ave

5 bd · 2 ba · 1,629 sqft · built 1954 · 0.137 acres

Last Sale Tax Bill Prior Sale Owner Records
$600,000Jul 2017 $15,4152025 Amount on Record May 2013 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

69 Ontario Ave

3.5 ba · 2,402 sqft · built 1954 · 0.144 acres

Last Sale Tax Bill Prior Sale Owner Records
—Aug 2021 $17,2272025 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jun 2026

70 Ontario Ave

2 ba · 1,594 sqft · built 1954 · 0.156 acres

Last Sale Tax Bill Prior Sale Owner Records
$425,000Oct 2011 $14,1712025 2 Names on Record Owner Occupied AssessorUpdated Jun 2026

71 Ontario Ave

2 ba · 1,325 sqft · built 1954 · 0.151 acres

Last Sale Tax Bill Prior Sale Owner Records
$11,2942025 2 Names on Record Owner Occupied AssessorUpdated Jun 2026

Wildfire Risk on Ontario Ave

Source: USDA Forest Service Wildfire Risk to Communities · 2nd edition (2024), fuels as of 2020

Wildfire RiskNot rated
no burnable land in reach
Wildfire LikelihoodNegligible
ExposureNone
beyond ember reach

Property Records in Nearby Streets