Here is a list of Niagara County Assessors arranged by municipality.
City of Lockport
Tracy Farrell -Assessor IAO
One Locks Plaza
Lockport, NY 14094
Phone - 716-439-6614
E-mail address - tfarrell@lockportny.gov
City of Niagara Falls 
James R. Bird - Assessor
745 Main Street
Niagara Falls, NY 14302
Phone - 716-286-4380
E-mail address - James.Bird@NiagarafallsNY.gov
City of North Tonawanda
http://www.northtonawanda.org
Barbara W. Klenke - Assessor
216 Payne Avenue
North Tonawanda, NY 14120
Phone - 716-695-8597
E-mail address - Barbarakle@northtonawanda.org
Town of Cambria
Debra Littere - Assessor
4160 Upper Mountain Road
Sanborn, NY 14132-9416
Phone - 716-433-8161 ext. 122
E-mail address - dlittere@townofcambria.com
Town of Hartland
Michael Hartman - Assessor IAO
8942 Ridge Road
Gasport, NY 14067
Phone - 716-735-7778
E-mail address – michaelhartman@townofhartlandny.us
Town of Lewiston
Linda E. Johnson - Assessor 
1375 Ridge Road, P.O. Box 330
Lewiston, NY 14092
Phone - 716-754-8213
E-mail address - Assessor@townoflewiston.us
Town of Lockport
Jill Lederhouse - Assessor 
6200 Robinson Road. Ext.
Lockport, NY 14094
Phone: 716-439-9526
E-mail - j_lederhouse@elockport.com
Town of Newfane
Mary Hastings - Assessor
2737 Main Street
Newfane, NY 14108
Phone- 716-778-8827 Ext. 105
E-mail - assessor@townofnewfane.com
Town of Niagara
pending - Assessor 
7105 Lockport Road
Niagara Falls, NY 14305
Phone - 716-297-2150 Ext. 130
E-mail address - assessor@townofniagara.com
Town of Pendleton
Jim Chisholm - Assessor 
6570 Campbell Boulevard
Lockport, NY 14094
Phone: 625-8833 Ext. 116
E-mail - assessor@pendletonny.us
Town of Porter 
Lena Villella - Acting Assessor
3265 Creek Road
Youngstown, NY 14174
Phone - 716-745-3730 Ext. 4
E-mail address - porterassessor@roadrunner.com
Town of Royalton
Michael Hartman - Assessor IAO
5316 Royalton Center Road
Middleport, NY 14105
Phone - 716-772-7826 Ext. 16
E-mail address - trassess@rochester.rr.com
Town of Somerset
Brian Pavlock - Assessor IAO
P. O. Box 368
Barker, NY 14012
Phone - 716-795-3575 Ext. 6
E-mail address - somersetassessor@roadrunner.com
Town of Wheatfield
Kelli Coughlin - Assessor
2800 Church Road
North Tonawanda, NY 14120
Phone - 716-694-9102
E-mail address - kellic@wheatfield.ny.us
Town of Wilson
James R. Bird - Assessor 
375 Lake Street, P.O. Box 537
Wilson, NY 14172
Phone - 716-751-6705 Ext. 15
E-mail address - towassessor@wilsonnewyork.com