diff --git a/extra/usa-cities/usa-cities-tests.factor b/extra/usa-cities/usa-cities-tests.factor
new file mode 100644
index 0000000000..2dbeafcfee
--- /dev/null
+++ b/extra/usa-cities/usa-cities-tests.factor
@@ -0,0 +1,6 @@
+! Copyright (C) 2009 Doug Coleman.
+! See http://factorcode.org/license.txt for BSD license.
+USING: accessors kernel tools.test usa-cities ;
+IN: usa-cities.tests
+
+[ t ] [ 55406 find-zip-code name>> "Minneapolis" = ] unit-test
diff --git a/extra/usa-cities/usa-cities.factor b/extra/usa-cities/usa-cities.factor
index deb3e15845..25ec30ac78 100644
--- a/extra/usa-cities/usa-cities.factor
+++ b/extra/usa-cities/usa-cities.factor
@@ -2,7 +2,7 @@
 ! See http://factorcode.org/license.txt for BSD license.
 USING: io.files io.encodings.ascii sequences generalizations
 math.parser combinators kernel memoize csv summary
-words accessors math.order binary-search ;
+words accessors math.order binary-search combinators.smart ;
 IN: usa-cities
 
 SINGLETONS: AK AL AR AS AZ CA CO CT DC DE FL GA HI IA ID IL IN
@@ -30,15 +30,17 @@ first-zip name state latitude longitude gmt-offset dst-offset ;
 MEMO: cities ( -- seq )
     "resource:extra/usa-cities/zipcode.csv" ascii <file-reader>
     csv rest-slice [
-        7 firstn {
-            [ string>number ]
-            [ ]
-            [ string>state ]
-            [ string>number ]
-            [ string>number ]
-            [ string>number ]
-            [ string>number ]
-        } spread city boa
+        [
+            {
+                [ string>number ]
+                [ ]
+                [ string>state ]
+                [ string>number ]
+                [ string>number ]
+                [ string>number ]
+                [ string>number ]
+            } spread
+        ] input<sequence city boa
     ] map ;
 
 MEMO: cities-named ( name -- cities )