[Python] Saving subplots in matplotlib as separate images

I am trying to save the six subplots I have created into separate image files. I can only get it to save the first subplot. How do I get it to save all 6 separately?

Here is my code:

# define the colors
color_palette = [{"Neon": "#ff0099", "Background": "#2e002e"},
{"Neon": "#00ff00", "Background": "#003300"},
{"Neon": "#00ccff", "Background": "#002233"},
{"Neon": "#ffff00", "Background": "#333300"},
{"Neon": "#ff6600", "Background": "#331a00"},
{"Neon": "#ff00ff", "Background": "#330033"}
]

# visualize networks
for idx, (city, edges) in enumerate(city_edges.items()):

# set the plot paramts
neon = color_palette[idx]['Neon']
color_bcg = color_palette[idx]['Background']
width = 0.5

# do the plot
f, ax = plt.subplots(1,1,figsize=(12,12))
edges.plot(ax = ax, color = neon, linewidth = width, alpha = 0.9)
ax.set_facecolor(color_bcg)

# get rid of the ticks
for xlabel_i in ax.get_xticklabels(): xlabel_i.set_visible(False)
for ylabel_i in ax.get_yticklabels(): ylabel_i.set_visible(False)
for tick in ax.get_xticklines(): tick.set_visible(False)
for tick in ax.get_yticklines(): tick.set_visible(False)

# add the title
ymin, ymax = plt.ylim()
extension = 0.1 * (ymax - ymin)
ax.set_ylim(ymin, ymax + extension)
ax.set_title(city, fontsize = 20, color = neon, y = 0.9)

plt.savefig("cities.png")

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