Duncan Ave, Wilmington, DE Property Records

New Castle County property records for 61 addresses on Duncan Ave, Wilmington, DE · Last verified October 2026

Duncan Ave Highlights

Properties 61
Median Sale Price $435,000
Deeds and Mortgages on File 69
Median Price per Sqft $253
Owner Occupied 85%
Median Annual Tax Bill $2,967
Median Year Built 1950
Median Ownership Tenure 15 years

Properties on Duncan Ave

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

5 Duncan Ave

1,400 sqft · built 1940 · 0.13 acres

Last Sale Tax Bill Prior Sale Owner Records
$3,1432025 Owner on Record AssessorUpdated Apr 2026

100 Duncan Ave

3 bd · 2 ba · 2,226 sqft · built 1945 · 0.169 acres

Last Sale Tax Bill Prior Sale Owner Records
$174,000Dec 2013 $3,2592025 2 Owners on Record Owner Occupied Assessor + 2 DocumentsUpdated May 2026

101 Duncan Ave

3 bd · 1.5 ba · 1,418 sqft · built 1937 · 0.3 acres

Last Sale Tax Bill Prior Sale Owner Records
$159,000Dec 2013 $2,8002025 Amount on Record May 2002 2 Owners on Record Owner Occupied AssessorUpdated May 2026

102 Duncan Ave

2 bd · 1 ba · 906 sqft · built 1932 · 0.15 acres

Last Sale Tax Bill Prior Sale Owner Records
$233,500Aug 2019 $2,6342025 Amount on Record May 2005 2 Owners on Record Owner Occupied Assessor + 2 DocumentsUpdated Apr 2026

103 Duncan Ave

3 bd · 1 ba · 1,456 sqft · built 1945 · 0.139 acres

Last Sale Tax Bill Prior Sale Owner Records
—Oct 1990 $9252025 2 Owners on Record Owner Occupied Assessor + 1 DocumentUpdated Aug 2026

104 Duncan Ave

3 bd · 1 ba · 1,578 sqft · built 1920 · 0.15 acres

Last Sale Tax Bill Prior Sale Owner Records
$252,000Jun 2021 $2,8962025 Amount on Record Jul 2008 Owner on Record Owner Occupied Assessor + 1 DocumentUpdated May 2026

104 Duncan Ave, #A

4 bd · 2.5 ba · 1,905 sqft · built 2009 · 0.15 acres

Last Sale Tax Bill Prior Sale Owner Records
$367,000May 2020 $3,6152025 Amount on Record Dec 2009 2 Owners on Record Assessor + 1 DocumentUpdated Apr 2026

105 Duncan Ave

3 bd · 2 ba · 1,726 sqft · built 1998 · 0.139 acres

Last Sale Tax Bill Prior Sale Owner Records
$158,900Sep 1998 Owner on Record Assessor + 2 DocumentsUpdated Apr 2026

106 Duncan Ave

3 bd · 1 ba · 1,488 sqft · built 1951 · 0.15 acres

Last Sale Tax Bill Prior Sale Owner Records
—Apr 1994 2 Owners on Record Owner Occupied AssessorUpdated May 2026

107 Duncan Ave

4 bd · 2.5 ba · 1,695 sqft · built 1945 · 0.189 acres

Last Sale Tax Bill Prior Sale Owner Records
$254,900Sep 2005 $3,5692025 Amount on Record Jul 2003 Owner on Record Owner Occupied Assessor + 1 DocumentUpdated Apr 2026

111 Duncan Ave

4 bd · 1.5 ba · 2,356 sqft · built 1945 · 0.35 acres

Last Sale Tax Bill Prior Sale Owner Records
—Aug 1989 $2,5812025 Owner on Record Owner Occupied AssessorUpdated May 2026

112 Duncan Ave

4 bd · 2 ba · 2,166 sqft · built 1950 · 0.369 acres

Last Sale Tax Bill Prior Sale Owner Records
$550,000Jun 2026 Amount on Record Apr 2026 2 Owners on Record Owner Occupied Assessor + 2 DocumentsUpdated Jul 2026

115 Duncan Ave

4 bd · 1 ba · 1,536 sqft · built 1950 · 0.26 acres

Last Sale Tax Bill Prior Sale Owner Records
—Jul 1985 $3,6242025 2 Owners on Record Owner Occupied AssessorUpdated May 2026

116 Duncan Ave

4 bd · 1.5 ba · 1,834 sqft · built 1951 · 0.23 acres

Last Sale Tax Bill Prior Sale Owner Records
—Aug 2024 $3,1742025 —Aug 2018 2 Owners on Record Owner Occupied Assessor + 1 DocumentUpdated Aug 2026

117 Duncan Ave

3 bd · 2 ba · 1,890 sqft · built 1965 · 0.21 acres

Last Sale Tax Bill Prior Sale Owner Records
Owner on Record Owner Occupied AssessorUpdated May 2026

118 Duncan Ave

4 bd · 2.5 ba · 2,290 sqft · built 2004 · 0.139 acres

Last Sale Tax Bill Prior Sale Owner Records
$235,000Jan 2004 $3,5802025 2 Owners on Record Owner Occupied Assessor + 2 DocumentsUpdated Jul 2026

120 Duncan Ave

3 bd · 2 ba · 1,842 sqft · built 1950 · 0.169 acres

Last Sale Tax Bill Prior Sale Owner Records
$300,175Dec 2018 $3,2742025 Amount on Record Apr 2016 2 Owners on Record Owner Occupied Assessor + 2 DocumentsUpdated Apr 2026

121 Duncan Ave

5 bd · 3 ba · 2,440 sqft · built 1950 · 0.26 acres

Last Sale Tax Bill Prior Sale Owner Records
$615,000Jun 2026 $4,2982025 Amount on Record May 2018 Owner on Record Owner Occupied Assessor + 5 DocumentsUpdated Jul 2026

122 Duncan Ave

3 bd · 2 ba · 1,788 sqft · built 2000 · 0.169 acres

Last Sale Tax Bill Prior Sale Owner Records
$150,000Sep 2000 Owner on Record Owner Occupied Assessor + 2 DocumentsUpdated Apr 2026

123 Duncan Ave

2 bd · 1 ba · 916 sqft · built 1950 · 0.13 acres

Last Sale Tax Bill Prior Sale Owner Records
$2,790,000Jul 2022 $2,5472025 —Jul 2022 Owner on Record Owner Occupied Assessor + 2 DocumentsUpdated Apr 2026

124 Duncan Ave

4 bd · 2.5 ba · 2,614 sqft · built 2000 · 0.239 acres

Last Sale Tax Bill Prior Sale Owner Records
$418,000Jun 2008 Amount on Record Oct 2004 2 Owners on Record Owner Occupied AssessorUpdated May 2026

125 Duncan Ave

2 bd · 1 ba · 916 sqft · built 1950 · 0.13 acres

Last Sale Tax Bill Prior Sale Owner Records
$125,000Nov 2000 $2,5242025 Owner on Record Owner Occupied Assessor + 1 DocumentUpdated Apr 2026

200 Duncan Ave

3 bd · 1.5 ba · 1,626 sqft · built 1948 · 0.3 acres

Last Sale Tax Bill Prior Sale Owner Records
$265,000Jul 2016 Amount on Record Jun 2012 2 Owners on Record Owner Occupied Assessor + 1 DocumentUpdated May 2026

201 Duncan Ave

3 bd · 1.5 ba · 1,150 sqft · built 1948 · 0.2 acres

Last Sale Tax Bill Prior Sale Owner Records
Owner on Record AssessorUpdated Apr 2026

202 Duncan Ave

3 bd · 1 ba · 1,512 sqft · built 1950 · 0.2 acres

Last Sale Tax Bill Prior Sale Owner Records
$30,800May 2022 $3,0302025 Amount on Record Jul 2016 2 Owners on Record Owner Occupied Assessor + 1 DocumentUpdated Apr 2026

203 1/2 Duncan Ave

3 bd · 1.5 ba · 1,260 sqft · built 1950 · 0.15 acres

Last Sale Tax Bill Prior Sale Owner Records
$3,0522025 Owner on Record Owner Occupied AssessorUpdated May 2026

203 Duncan Ave, #A

3 bd · 1.5 ba · 1,260 sqft · built 1950 · 0.15 acres

Last Sale Tax Bill Prior Sale Owner Records
$435,000Oct 2024 $3,2592025 Amount on Record Oct 2013 2 Owners on Record Owner Occupied Assessor + 2 DocumentsUpdated Apr 2026

204 Duncan Ave

3 bd · 1 ba · 1,044 sqft · built 1940 · 0.25 acres

Last Sale Tax Bill Prior Sale Owner Records
$2,7412025 2 Owners on Record Owner Occupied Assessor + 3 DocumentsUpdated May 2026

205 Duncan Ave

4 bd · 2.5 ba · 1,424 sqft · built 1948 · 0.169 acres

Last Sale Tax Bill Prior Sale Owner Records
$148,000Aug 2001 $3,3392025 Owner on Record Owner Occupied Assessor + 1 DocumentUpdated May 2026

206 Duncan Ave

3 bd · 1.5 ba · 1,218 sqft · built 1951 · 0.25 acres

Last Sale Tax Bill Prior Sale Owner Records
$135,000Aug 1992 Owner on Record Owner Occupied AssessorUpdated May 2026

207 Duncan Ave

3 bd · 1 ba · 1,280 sqft · built 1948 · 0.18 acres

Last Sale Tax Bill Prior Sale Owner Records
$2,600Jul 2022 Owner on Record Owner Occupied Assessor + 1 DocumentUpdated Apr 2026

208 Duncan Ave

4 bd · 2 ba · 1,766 sqft · built 1948 · 0.28 acres

Last Sale Tax Bill Prior Sale Owner Records
$456,000Jan 2026 $1,3362025 —Feb 1999 2 Owners on Record Assessor + 1 DocumentUpdated Apr 2026

209 Duncan Ave

3 bd · 1 ba · 1,080 sqft · built 1948 · 0.18 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,9562025 Owner on Record Owner Occupied Assessor + 1 DocumentUpdated Apr 2026

210 Duncan Ave

3 bd · 1.5 ba · 1,215 sqft · built 1950 · 0.169 acres

Last Sale Tax Bill Prior Sale Owner Records
$44,000Jul 1979 $1,9952025 2 Owners on Record Owner Occupied AssessorUpdated May 2026

211 Duncan Ave

3 bd · 2 ba · 1,280 sqft · built 1948 · 0.18 acres

Last Sale Tax Bill Prior Sale Owner Records
$205,000Mar 2009 $3,6032025 2 Owners on Record Owner Occupied Assessor + 2 DocumentsUpdated Jul 2026

212 Duncan Ave

3 bd · 1.5 ba · 1,401 sqft · built 1951 · 0.169 acres

Last Sale Tax Bill Prior Sale Owner Records
$262,200Jan 2007 $2,7402025 2 Owners on Record Owner Occupied AssessorUpdated Oct 2026

213 Duncan Ave

3 bd · 1.5 ba · 976 sqft · built 1955 · 0.139 acres

Last Sale Tax Bill Prior Sale Owner Records
$254,000Mar 2010 $2,9052025 2 Owners on Record Owner Occupied Assessor + 1 DocumentUpdated May 2026

214 Duncan Ave

2 bd · 1 ba · 1,099 sqft · built 1951 · 0.18 acres

Last Sale Tax Bill Prior Sale Owner Records
$224,900Jan 2004 2 Owners on Record Owner Occupied AssessorUpdated Apr 2026

215 Duncan Ave

3 bd · 1.5 ba · 976 sqft · built 1955 · 0.139 acres

Last Sale Tax Bill Prior Sale Owner Records
—Mar 2020 $2,7232025 Amount on Record Jan 2008 2 Owners on Record Owner Occupied Assessor + 1 DocumentUpdated May 2026

216 Duncan Ave

3 bd · 2 ba · 1,127 sqft · built 1950 · 0.18 acres

Last Sale Tax Bill Prior Sale Owner Records
$481,000Nov 2025 Amount on Record Jan 2020 Owner on Record Owner Occupied Assessor + 5 DocumentsUpdated Apr 2026

217 Duncan Ave

3 bd · 1.5 ba · 976 sqft · built 1955 · 0.139 acres

Last Sale Tax Bill Prior Sale Owner Records
Owner on Record Owner Occupied Assessor + 2 DocumentsUpdated Jul 2026

218 Duncan Ave

3 bd · 1.5 ba · 1,215 sqft · built 1950 · 0.18 acres

Last Sale Tax Bill Prior Sale Owner Records
$483,890May 2026 $2,8392025 Amount on Record May 2016 Owner on Record Owner Occupied Assessor + 2 DocumentsUpdated May 2026

219 Duncan Ave

3 bd · 1.5 ba · 976 sqft · built 1955 · 0.139 acres

Last Sale Tax Bill Prior Sale Owner Records
$269,900Sep 2016 $2,9672025 Owner on Record Owner Occupied Assessor + 1 DocumentUpdated Apr 2026

220 Duncan Ave

3 bd · 2 ba · 1,320 sqft · built 1948 · 0.18 acres

Last Sale Tax Bill Prior Sale Owner Records
$260,000Apr 2011 $3,1122025 Amount on Record Jan 2011 2 Owners on Record Owner Occupied AssessorUpdated May 2026

221 Duncan Ave

3 bd · 1.5 ba · 976 sqft · built 1955 · 0.139 acres

Last Sale Tax Bill Prior Sale Owner Records
$244,000Aug 2019 $3,0522025 —Jul 1979 2 Owners on Record Owner Occupied Assessor + 1 DocumentUpdated Apr 2026

222 Duncan Ave

3 bd · 1 ba · 1,404 sqft · built 1948 · 0.18 acres

Last Sale Tax Bill Prior Sale Owner Records
$275,000Mar 2019 $2,9602025 Owner on Record Owner Occupied Assessor + 3 DocumentsUpdated Apr 2026

223 Duncan Ave

3 bd · 1.5 ba · 1,256 sqft · built 1955 · 0.139 acres

Last Sale Tax Bill Prior Sale Owner Records
$50,000Dec 1993 $2,1982025 Owner on Record Owner Occupied AssessorUpdated May 2026

224 Duncan Ave

3 bd · 1.5 ba · 1,215 sqft · built 1950 · 0.18 acres

Last Sale Tax Bill Prior Sale Owner Records
$137,900May 1999 $3,0072025 2 Owners on Record Owner Occupied Assessor + 5 DocumentsUpdated May 2026

225 Duncan Ave

3 bd · 1.5 ba · 976 sqft · built 1955 · 0.139 acres

Last Sale Tax Bill Prior Sale Owner Records
$260,000Mar 2020 $2,8982025 Amount on Record Apr 2012 Owner on Record Owner Occupied Assessor + 1 DocumentUpdated May 2026

226 Duncan Ave

3 bd · 2 ba · 1,604 sqft · built 1948 · 0.18 acres

Last Sale Tax Bill Prior Sale Owner Records
$138,000Feb 1993 $3,2282025 2 Owners on Record Owner Occupied AssessorUpdated May 2026

227 Duncan Ave

3 bd · 1.5 ba · 976 sqft · built 1955 · 0.139 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,1112025 Owner on Record Owner Occupied AssessorUpdated May 2026

228 Duncan Ave

3 bd · 1.5 ba · 1,192 sqft · built 1948 · 0.18 acres

Last Sale Tax Bill Prior Sale Owner Records
$260,000Jun 2007 $3,0292025 2 Owners on Record Owner Occupied Assessor + 1 DocumentUpdated May 2026

229 Duncan Ave

3 bd · 1.5 ba · 976 sqft · built 1955 · 0.139 acres

Last Sale Tax Bill Prior Sale Owner Records
—Oct 1998 Owner on Record Owner Occupied AssessorUpdated Apr 2026

230 Duncan Ave

3 bd · 1 ba · 1,350 sqft · built 1950 · 0.369 acres

Last Sale Tax Bill Prior Sale Owner Records
Owner on Record AssessorUpdated Apr 2026

231 Duncan Ave

3 bd · 1.5 ba · 1,242 sqft · built 1955 · 0.139 acres

Last Sale Tax Bill Prior Sale Owner Records
$121,750Sep 2004 2 Owners on Record Owner Occupied AssessorUpdated May 2026

233 Duncan Ave

3 bd · 2 ba · 1,253 sqft · built 1955 · 0.139 acres

Last Sale Tax Bill Prior Sale Owner Records
$245,000Dec 2011 2 Owners on Record Owner Occupied AssessorUpdated May 2026

234 Duncan Ave

3 bd · 2 ba · 1,485 sqft · built 1956 · 0.189 acres

Last Sale Tax Bill Prior Sale Owner Records
$185,000May 2025 —Jul 2000 Owner on Record AssessorUpdated Apr 2026

235 Duncan Ave

4 bd · 2 ba · 1,319 sqft · built 1955 · 0.139 acres

Last Sale Tax Bill Prior Sale Owner Records
$168,750Oct 2015 $3,0802025 Owner on Record Owner Occupied Assessor + 3 DocumentsUpdated May 2026

236 Duncan Ave

4 bd · 2 ba · 1,485 sqft · built 1956 · 0.189 acres

Last Sale Tax Bill Prior Sale Owner Records
Owner on Record Assessor + 1 DocumentUpdated Apr 2026

237 Duncan Ave

3 bd · 1.5 ba · 976 sqft · built 1955 · 0.28 acres

Last Sale Tax Bill Prior Sale Owner Records
$222,000Dec 2003 $2,7062025 Owner on Record Owner Occupied Assessor + 1 DocumentUpdated Apr 2026

238 Duncan Ave

3 bd · 2 ba · 1,144 sqft · built 1955 · 0.31 acres

Last Sale Tax Bill Prior Sale Owner Records
$227,250Sep 2016 $2,9662025 Amount on Record Jan 2016 2 Owners on Record Assessor + 1 DocumentUpdated May 2026

Property Records in Nearby Streets