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Captain Gyrography
The Numbers Mason...
Flavor Town
100

According to the Rules Reference this is Step 1 of setup

Place the Game Board

100

This combat item cancels the 2nd most Dracula combat cards

Crucifix

100

This ocean region is connected to the fewest large cities

Adriatic (zero)

100

This is the maximum number of Dracula cards Dracula may hold in his hand

4

100

According to the flavor text on Escape, escape is describing a confrontation in this type of city

Port

200

According to the Rules Reference regarding the Encounter Steps if Dracula moves to a location with a hunter in it he cannot place an encounter or do this

Place a rumor token

200

This card has been played the least number of times according to the leaderboards

(Blood transfusion at the time this question was written. Yes even more than customs search) 

200

This is the only city in the game with an achievement associated with it

Toulouse

200

In second edition Seward could hold this number of items/events in total

7

200

The flavor text on Surprising Return describes this ally

Jonathan Harker

300

In a team game hunters must openly discuss things and may not confer in private except in these circumstances

When trading or using Van Helsing's leadership ability

300

The symbol on vampire cards denoting HP is this:

Physical Heart

300

Hunters may not perform the normal supply action in these spaces

Ocean Spaces, Castle Dracula, Hospital Spaces

300

The maximum number of road spaces that a horse may be used to travel in a single day is this

8
(With renewed vigor, trading and 4 hunters that can travel to each other in a line)

300

Dodge's flavor text describes fighting this

One of Dracula's vile spawn

400

According to the Escape as Bat rules this is what happens to the escape as bat card if it is on a location which Dracula promotes to a lair

it is discarded

400

The encounter reckless vampire has art unique to digital edition. It's original artwork from third edition is now used to represent this card in digital

Fangs

400

These are the only large cities without rail access

Nantes, Lisbon, Athens, Amsterdam

400

Cagliari is a city with this number associated with it

13

400

According to the flavor text in blood transfusion this is why it works

We don't know 

(lol)

500

While we like to say Dracula can escape when the round marker reaches despair +2. The rulebook describes the rule in this way:

if Dracula plays escape as bat or escape as mist before he has played a number of cards greater than the number of despair on the time track the card is canceled. 

500

The card Great Wolf in second edition was named this:

Quincy Morris

500

If a "long rail" is defined as a rail which accomplishes two roads worth of movement in a single segment, then these are the only cities connected to two long rails

Bordeaux and Paris

500

The number of places on the map that hunters may legally exist is this number

73
(60 cities/Castle Dracula, 10 ocean spaces, 3 hospitals)

500
The flavor text on Lucky Find references this war:

The Russo-Turkish War