diff --git a/lib/gtfs/source.rb b/lib/gtfs/source.rb
index a2c7818..a66311c 100644
--- a/lib/gtfs/source.rb
+++ b/lib/gtfs/source.rb
@@ -72,6 +72,10 @@ def raise_if_missing_source(filename)
       define_method "each_#{entity.singular_name}".to_sym do |&block|
         entity.each(File.join(@tmp_dir, entity.filename)) { |model| block.call model }
       end
+
+      define_method "#{entity.name}_count".to_sym do |&block|
+        count = File.foreach(File.join(@tmp_dir, entity.filename)).inject(-1) {|c, _| c+1}
+      end
     end
 
     def files
diff --git a/lib/gtfs/version.rb b/lib/gtfs/version.rb
index 697769d..90aff31 100644
--- a/lib/gtfs/version.rb
+++ b/lib/gtfs/version.rb
@@ -1,3 +1,3 @@
 module GTFS
-  VERSION = '0.3.0'
+  VERSION = '0.3.1'
 end
diff --git a/spec/gtfs/source_spec.rb b/spec/gtfs/source_spec.rb
index 95a2992..7cab38c 100644
--- a/spec/gtfs/source_spec.rb
+++ b/spec/gtfs/source_spec.rb
@@ -59,6 +59,16 @@
     end
   end
 
+  describe '#agencies_count' do
+    subject {source.agencies_count}
+
+    context 'when the source has agencies' do
+      let(:source) {GTFS::Source.build(valid_local_source)}
+
+      it {should eq 1}
+    end
+  end
+
   describe '#stops' do
   end