or over. Cities and towns Edit Map of Leavenworth County ( map legend ) Added by PhloxBot Incorporated cities Edit Name and population (2005 estimate): [5] Leavenworth , 35,213 (county seat) Lansing , 10,214 Tonganoxie , 3,774 Basehor , 3,287 Linwood , 382 Easton , 357 Bonner Springs Unincorporated places Edit Coldspur