In New Jersey I see small flocks 8-12 almost every I go birding pretty much year round.  I work on a military base and almost every pocket I go birding I will see crows.   There are also two Ravens you can see on any given day.  I see really large flocks of Starlings, common grackles and red wing blackbirds.

I live in the Portland OR area, so I get to see groups of crows flying from their territories around my neighborhood to downtown Portland for an evening roost.

I recently saw a large flock foraging in a field while I was in NJ. Near me in NYC, I don’t often see flocks of high numbers, but instead see smaller groups (maybe 25-30 max). I do see them intermix, often with starlings and gulls.

There’s an outdoor amphitheater that puts on indie concerts.  My favorite part of that venue is the huge flock of crows flying overhead-hundreds and hundreds.  I’m going this weekend and already looking forward to observing them!  I suspect they roost nearby. We have roosts of Amazon parrots and parakeets in my area.  In the winter as many as 2000 parrots will fly overhead-it’s deafening and also really cool.  Easy for me to say since I’m not getting awoken at sun up  every day.  They’ve actually been suffering from violence over the last few years.

Near sundown in downtown Sacramento where my shop is there are many crows who meet up in the sycamore/London Plane trees around our courtyard before flying toward downtown to roost for the night.

1. I have noticed foraging flocks in my area. They tend to hang out in the nearby agricultural fields. One set of fields rotates through organic vegetables and the other grows grass/sod. One set of fields grows a variety of vegetables while the other is a monoculture of grass. The grass is harvested which leaves exposed soil. Sometimes I will see large flocks of crows feeding on the recently tilled soil. The size of the flocks varies. I would say it averages anywhere from 100 birds to 500+ birds on a busy day. 2. I have seen other bird species form large flocks. They were snow geese.

I have seen flocks of crows on cut down corn and soybean fields, munching on a midday snack. :)

Yes, I have seen other birds form large flocks. Starlings, be exact. They create these huge amazing murmurations that are really cool to look at! :)

Yes. We have a pecan tree in our backyard. There’s a group of about 3 to 5 crows that hold morning meetings in our back yard. Before an unusually bad snowstorm in 2021, robins formed huge flocks in our neighborhood desperately looking for any food they could find. It was almost like an omen. I am in a suburb of Dallas, TX

1. Unfortunately, I have never seen a foraging flock in NYC.  I find it unusual to see more than two or three crows together at a time. 2.  We do, however, have foraging flocks of grackles, redwing blackbirds, and starlings.  There is one spot where I routinely see all three species foraging together.  It seems like younger birds.

Large groups of crows gather at a nearby city reservoir to get water.  Most hang out in the nearby trees, especially if an eagle or other raptor also pauses in the trees.  They are doing it right now, so October.  Probably 50-80. Saw two different large groups at another Larger reservoir a few days ago. The two groups probably was 100-150 combined.

Fall is just beginning, and I'm in the Sierra Foothills.  No, I'm not seeing foraging flocks at this time, though I'm hoping that maybe I will as we get into winter.  Usually I only see one or two crows at a time, and they seem to always be passing through.  I'd love for them to stick around so that I could better observe them, but that hasn't been the case yet.  Before I retired two years ago, my work days drew me to the valley and great expanses of open agricultural land.  It was in that area that I more often saw the crows.  Many of my lunch breaks were taken at park that was skirted by a walnut orchard.  I'd often be treated to great entertainment watching the crows scavenge for fallen walnuts at harvest time.  And it was in this area, too, where I'd watch very large flocks of migratory birds every year.  Snow Geese, Canada Geese, Whistling Swans.

Number 2.  At migration time, Canada Geese form up in larger groups.  As I was watching the above video, I was thinking about the geese.  We always have a mating pair just down the road at the lagoon.  They come back year after year.  This year,  we noticed that the family group of 6 - 8 was joined by  other geese to make the group about 20-25.  I wondered if they were the siblings of the mating pair with their new families.  About a week or two later, our group was gone but the about a half a mile down the road was a much bigger group of geese.  My assumption was they were preparing for migration.

We were coming thru a town in NY in the fall 2 years ago and noticed as it approached dusk that a bunch of crows were flying into town from ALL directions!   We started following and looking for the flock - literally THOUSANDS of crows were coming into one area of the town near the railroad tracks.  We got a bunch of photos and videos and reported it on iNaturalist and E-Bird so that if a researcher is using the data they would know where the flock was congregating.   It was LOUD and amazing to watch them socializing and preening before going to sleep.

No large flocks, I mostly see crows in the winter at the feeders

I've seen foraging flocks in fields in winter months but unsure how I could estimate the size.

I live on Malcolm Island, a small island off of the northern tip of Vancouver Island in British Columbia.  Flocks of crows are common year-round, frequently foraging on the beach at low tide and around the deciduous trees and conifers above the beaches.   These are the typical BC coastal beaches: quite rocky, covered in seaweed, with piles of logs at the tide line (these float in off barges).  The climate here is mild year-round compared to other parts of Canada, although the wind and rain storms from November through February are quite strong.   The crows move off the beaches during those months whenever a big storm comes in, but otherwise forage on the beaches all winter long.  They frequently and fearlessly harry the bald eagles that roost in trees by the water, sometimes in groups of 3-5 crows but often one-on-one.  The eagles are clearly annoyed but I've never seen any aggression by eagles toward crows.  Ravens are common here, more so in forested areas than on the beach.  The crows are afraid the ravens.   Vehicular traffic is thankfully very limited here and small flocks of crows frequently forage along the small road that runs parallel to the beach.  Average size of flock around my house: 20 -30 crows.  Our house fronts the beach. We have a resident bonded pair that nests in a very tall cedar hedge on one side of our property.  They spend many hours sitting at the top of a weeping beech down by the water's edge. Flocks of crows also gather by the ferry dock and down at the harbour where the fishing boats and recreational boats dock, as do gulls. We have fewer large flocks of gulls here than I expected, although that may be true just in our particular west-facing area of Malcolm Island.   I've seen large flocks of crows at other ferry terminals around Vancouver Island, even the more urban ones.  I've not noticed any sick looking crows here.  As for other large flocks of birds, this morning I was lucky enough to see a flock of 20 or so American White Pelicans on the water in font of or house - very rare visitors, as they nest at a lake in the BC interior.  Last summer white pelicans were sighted around Victoria, in the southern tip of Vancouver Island and mid-Island around Nanaimo, but our location is pretty far north.  What an amazing sight to see them rise from the water! Other flocking birds here: starlings.

We have crows in a backyard park. They seem to be here all year round but they appear in family groupings. The largest flocks I know of are in Bothell where they roost in the winter.

We see them family groups most of the year, but flocks most commonly late fall and winter.  The group up and fly into Glens Falls to take advantage of the urban heat bubble and range out onto agricultural fields in Washington County for food.  Of course Canada geese, in southern Washington County we see snow geese, Starlings, pigeons, and this year we have a flock of about 60 red wing black birds stop at the feeders in front of the office.

A few days ago I watched a group of about 10 crows playing around in the woods behind my house. Their kept going between my leaf litter and the trees. I have learned over the years to watch where they frequent in my yard, it can tell me where a hen was laying "hidden" eggs, and unfortunatly where a rabbit nest had been. They also love to forage around in my compost pile.

A few years back I was in Augusta Maine by the mall about  5:00 or 6:00 pm  it was an amazing sight.and saw a very large flock of crows flying in. There were hundreds of the. It was winter time.

1. No foraging flocks in the city that I’ve noticed.  Only family groups. 2. Have in the past seen large groups of waxwings fly through my end of the city, can’t recall time of year.  More recently (fall and winter) there have been small flocks of yellow finches stopping at my feeders.

I live in a rural area with large farms with fields that are gleaned aggressively by flocks of crows in the fall.  The largest flock I saw was in the 20 to 30 range.  There is a main family group in my neighborhood that makes several rounds each day.  The family. Visits my yard everyday in the late morning to early afternoon.  Three to five forage for bits of seed, peanuts and suet that I place for song birds.  If I walk in my neighborhood I am followed by at least one crow who announces my presence.  Sometimes one or two will follow me around to keep tabs on me.  

1.Recently, I have seen a large flock of crows that roosted in the fir trees . It was near the sidewalk and near  people's houses. There were about 200 individuals. 2. I have seen a big flock of brewer's blackbirds around the parking lot near the mall.