It also demonstrates the difference those two colors can make.
RELATED: California COVID-19 tiers: Marin is the last Bay Area county not on total lockdown
In San Francisco, the main parking lot remains closed for that iconic landmark.
At Vista Point on the Marin side, visitors are free to come and go.
"You aren't wearing a mask," we pointed out to Sean O'Brien from Montana.
"We don't do that in Montana. We live free in Montana," he said. "It's just the flu."
That defense does not play well in neighboring Sausalito.
VIDEO: Bay Area surpasses 'summer surge' for most COVID-19 cases of pandemic
"I would say he needs to wear a mask. Everybody does," said Dennis Webb, a local contractor.
The sentiment rings especially true, here. After seeing the bridge, Sausalito is often the first stop for visitors, including those from infected areas. Outsiders have become a legitimate concern for Dr. Matt Willis, who runs Marin County Health.
"The possibility of us being a destination is somewhat concerning," said Dr. Willis.
Sausalito ranks 12th among Marin Cities for COVID-19 infection rates, but the county's numbers show that they have doubled in this small community during the last month. It could be the precursor to a trend.
While Marin remains the only Bay Area county still in the red COVID tier, Dr. Willis expects to see it become purple within two weeks, and perhaps sooner.
RELATED: UCSF doctor sheds light on what new shelter-in-place order in California could look like
"In October we had ten cases a day. Now we have 30 per day in the county. At 40, we'll be purple. Our rates are rising, just not as rapidly as other areas around us," said Dr. Willis.
Marin County tests at twice the state average. That helps to identify cases early. But people from out of town remain an unknown factor, especially in the cities near the county line.
At the Sausalito Bakery and Café, Farida Azar wonders constantly about outsiders bringing the virus into her business of sixteen years.
"They wear masks, but we are very close to the city. Close to the city is convenient for people to visit us. There is more concern here than elsewhere," said Azar.
That concern remains unrealized, thus far, but trending.
See the tracker below to find out how COVID-19 cases are trending in your county.
App users: For a better experience, click here to view the full trend tracker in a new window
If you have a question or comment about the coronavirus pandemic, submit yours via the form below or here.
Get the latest news, information and videos about the novel coronavirus pandemic here
RELATED STORIES & VIDEOS:
- Map: CA counties that can, can't reopen under new rules
- COVID-19 risk calculator: The safest and most dangerous things to do this holiday season
- Want to get a COVID-19 test in time for the holidays? Here's what you need to know
- Updated number of COVID-19 deaths, cases in Bay Area
- Map shows everywhere you can get a COVID-19 test in the Bay Area
- COVID-19 Diaries: Personal stories of Bay Area residents during pandemic
- California EDD: The most commonly asked questions we get about unemployment and PUA
- Health experts urge flu shots in effort to avoid 'twindemic'
- How to tell the difference between seasonal allergies and coronavirus symptoms
- Here's which mask is better to protect from COVID-19
- First COVID-19 vaccine volunteers in US describe experience as Bay Area launches vaccine trials
- Coronavirus origin: Where did COVID-19 come from?
- What is a COVID-19 genetic, antigen and antibody test?
- What will it take to get a COVID-19 vaccine and how will it be made?
- What does COVID-19 do to your body and why does it spread so easily?
- Here's how shelter in place, stay at home orders can slow spread of COVID-19
- Coronavirus Timeline: Tracking major moments of COVID-19 pandemic in San Francisco Bay Area
- Coronavirus Doctor's Note: Dr. Alok Patel gives his insight into COVID-19 pandemic