Agriculture (AG) - 2009

Agriculture (AG) - 2010

Agriculture (AG) - 2015

Agriculture (AG) - 2017

Agriculture (AG) - 2018

Agriculture (AG) - 2021

Agriculture (AG) - 2022

Agriculture (AG) - 2023

Animal Welfare (AW) - 2016

Animal Welfare (AW) - 2018

Animal Welfare (AW) - 2020

Animal Welfare (AW) - 2023

Barbara Bush Children's Hospital - 2023

Portland Bicycle - 1949

Breast Cancer (BC) - 2014

Breast Cancer (BC) - 2019

Breast Cancer (BC) - 2021

Breast Cancer (BC) - 2022

Conservation (CR) - 1995

Conservation (CR) - 1996-1998

Conservation (CR) - 1997

Conservation (CR) - 1999 

Conservation (CR) - 2000

Conservation (CR) - 2008

Conservation (CR) - 2011

Conservation (CR) - 2014

Conservation (CR) - 2015

Conservation (CR) - 2023

Lighthouse (LH) - 2024

Lobster (LB) - 2021

Lobster (LB) - Error Unpainted Letters

Troop Support (TS) - 2013

Troop Support (TS) - 2020

University of Maine (UM) - 2002

University of Maine (UM) - 2004

University of Maine (UM) - 2010

University of Maine (UM) - 2018

Wabanaki - 2016 (issued earlier)

Wildlife - 2012

Wildlife - 2018

Wildlife - 2020