Newcastle, Washington (English Wikipedia)

"2024 U.S. Gazetteer Files". United States Census Bureau. Retrieved November 28, 2024.
U.S. Census Bureau Geography Division (December 21, 2020). 2020 Census – School District Reference Map: King County, WA (PDF) (Map). 1:80,000. United States Census Bureau. p. 2. Retrieved August 3, 2022.

"City and Town Population Totals: 2020–2023". United States Census Bureau. November 28, 2024. Retrieved November 28, 2024.
"Census of Population and Housing". United States Census Bureau. Retrieved June 4, 2015.

civiclive.com

City of Newcastle (May 23, 2022). "Newcastle Trail System Map" (PDF). Archived (PDF) from the original on July 10, 2024. Retrieved September 1, 2024.

"King County and City Landmarks List". (372 KB). King County (undated, last modified March, 2014). Retrieved September 28, 2014.

Tim Pfarr (September 3, 2009). "Postal Service denies city new ZIP code". Newcastle News. Archived from the original on May 4, 2014. Retrieved July 5, 2012.
"City continues fight for new ZIP code". Newcastle News. June 5, 2009. Archived from the original on December 22, 2010. Retrieved July 5, 2012.
Jim Feehan (July 3, 2009). "ZIP code survey shows delivery, tax problems". Newcastle News. Archived from the original on May 4, 2014. Retrieved July 5, 2012.

"City Profile and History". City of Newcastle. Archived from the original on May 19, 2009. Retrieved August 9, 2009.

"The Golf Club at Newcastle - History". Archived from the original on September 22, 2018. Retrieved August 7, 2023.

Mike Lindblom (August 9, 2000). "ZIP-code blues tax Newcastle". The Seattle Times. Archived from the original on November 22, 2023. Retrieved July 5, 2012.

"Monthly Averages for Newcastle, WA". The Weather Channel. Retrieved April 20, 2016.

"City Profile and History". City of Newcastle. Archived from the original on May 19, 2009. Retrieved August 9, 2009.
City of Newcastle (May 23, 2022). "Newcastle Trail System Map" (PDF). Archived (PDF) from the original on July 10, 2024. Retrieved September 1, 2024.
Tim Pfarr (September 3, 2009). "Postal Service denies city new ZIP code". Newcastle News. Archived from the original on May 4, 2014. Retrieved July 5, 2012.
"City continues fight for new ZIP code". Newcastle News. June 5, 2009. Archived from the original on December 22, 2010. Retrieved July 5, 2012.
Jim Feehan (July 3, 2009). "ZIP code survey shows delivery, tax problems". Newcastle News. Archived from the original on May 4, 2014. Retrieved July 5, 2012.
"The Golf Club at Newcastle - History". Archived from the original on September 22, 2018. Retrieved August 7, 2023.