Look at this great zarp samaritan he even had a bunch of maps ready. I've prepared a few of my own given how much I've been thinking about a zombie survival server.
zs_3rdstreet
zs_abandoned_subway
zs_ambush
zs_ambush_v2
zs_antarctic_hospital
zs_apex_v3
zs_arctic_cave
zs_barren
zs_bunker_fixed_v2
zs_buntshot
zs_castle_keep
zs_cavecomplex_v2
zs_city_14_fixed
zs_darkside
zs_darkvilla
zs_darkvilla_v2
zs_deep_sewers_v2d
zs_dl_powercliff
zs_dryfield_v4
zs_farmhouse_night_v2
zs_house_outbreak_fixed_v2
zs_infirmary
zs_junkyard
zs_krusty_krab_large_v5
zs_lambdacore
zs_last_mansion_v3
zs_lighthouse_v1
zs_lv426_v4
zs_mountains_of_the_afterlife2
zs_muhosransk_v3
zs_obj_bluevelvet_v4
zs_obj_dump_v14
zs_obj_station
zs_obj_vertigo_v25
zs_pathogen
zs_shelter
zs_slugde
zs_subversive_part3_fix
zs_subversive_v2_fix
zs_subway_v9
zs_swimming_pool_v2
zs_urban_strain
zs_warehouse_v2