Pęczki-Kozłowo was formerly part of the German Empire. In the German Empire, the place was called Peczki Kozlowo Dorf.
The place is now called Pęczki-Kozłowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Peczki Kozlowo Wies | Russian Empire | Cehanov | 1914 |
| Pęczki-Kozłowo | Poland | Ciechanów | 1919 |
| Peczki Kozlowo Dorf | German Empire | Zichenau | 1939 |
| Pęczki-Kozłowo | Poland | Ciechanów | 1945 |
| Pęczki-Kozłowo | Poland | Ciechanów | 1992 |